diff --git a/src/core/server/saved_objects/service/lib/repository.test.js b/src/core/server/saved_objects/service/lib/repository.test.js
index 40c3fdb7d0857f4..6d6d6c0a32d8ce6 100644
--- a/src/core/server/saved_objects/service/lib/repository.test.js
+++ b/src/core/server/saved_objects/service/lib/repository.test.js
@@ -20,6 +20,7 @@
 import { SavedObjectsRepository } from './repository';
 import * as getSearchDslNS from './search_dsl/search_dsl';
 import { SavedObjectsErrorHelpers } from './errors';
+import { ALL_NAMESPACES_STRING } from './utils';
 import { SavedObjectsSerializer } from '../../serialization';
 import { encodeHitVersion } from '../../version';
 import { SavedObjectTypeRegistry } from '../../saved_objects_type_registry';
@@ -725,6 +726,12 @@ describe('SavedObjectsRepository', () => {
         });
       };
 
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.bulkCreate([obj3], { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`returns error when type is invalid`, async () => {
         const obj = { ...obj3, type: 'unknownType' };
         await bulkCreateError(obj, undefined, expectErrorInvalidType(obj));
@@ -1042,6 +1049,13 @@ describe('SavedObjectsRepository', () => {
         });
       };
 
+      it(`throws when options.namespace is '*'`, async () => {
+        const obj = { type: 'dashboard', id: 'three' };
+        await expect(
+          savedObjectsRepository.bulkGet([obj], { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`returns error when type is invalid`, async () => {
         const obj = { type: 'unknownType', id: 'three' };
         await bulkGetErrorInvalidType([obj1, obj, obj2]);
@@ -1467,6 +1481,12 @@ describe('SavedObjectsRepository', () => {
         });
       };
 
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.bulkUpdate([obj], { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`returns error when type is invalid`, async () => {
         const _obj = { ...obj, type: 'unknownType' };
         await bulkUpdateError(_obj, undefined, expectErrorNotFound(_obj));
@@ -1477,6 +1497,15 @@ describe('SavedObjectsRepository', () => {
         await bulkUpdateError(_obj, undefined, expectErrorNotFound(_obj));
       });
 
+      it(`returns error when object namespace is '*'`, async () => {
+        const _obj = { ...obj, namespace: '*' };
+        await bulkUpdateError(
+          _obj,
+          undefined,
+          expectErrorResult(obj, createBadRequestError('"namespace" cannot be "*"'))
+        );
+      });
+
       it(`returns error when ES is unable to find the document (mget)`, async () => {
         const _obj = { ...obj, type: MULTI_NAMESPACE_TYPE, found: false };
         const mgetResponse = getMockMgetResponse([_obj]);
@@ -1630,7 +1659,7 @@ describe('SavedObjectsRepository', () => {
       );
     };
 
-    describe('cluster calls', () => {
+    describe('client calls', () => {
       it(`doesn't make a cluster call if the objects array is empty`, async () => {
         await checkConflicts([]);
         expect(client.mget).not.toHaveBeenCalled();
@@ -1662,6 +1691,14 @@ describe('SavedObjectsRepository', () => {
       });
     });
 
+    describe('errors', () => {
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.checkConflicts([obj1], { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+    });
+
     describe('returns', () => {
       it(`expected results`, async () => {
         const unknownTypeObj = { type: 'unknownType', id: 'three' };
@@ -1909,6 +1946,12 @@ describe('SavedObjectsRepository', () => {
     });
 
     describe('errors', () => {
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.create(type, attributes, { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`throws when type is invalid`, async () => {
         await expect(savedObjectsRepository.create('unknownType', attributes)).rejects.toThrowError(
           createUnsupportedTypeError('unknownType')
@@ -2120,6 +2163,12 @@ describe('SavedObjectsRepository', () => {
         );
       };
 
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.delete(type, id, { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`throws when type is invalid`, async () => {
         await expectNotFoundError('unknownType', id);
         expect(client.delete).not.toHaveBeenCalled();
@@ -2169,6 +2218,20 @@ describe('SavedObjectsRepository', () => {
         expect(client.get).toHaveBeenCalledTimes(1);
       });
 
+      it(`throws when the type is multi-namespace and the document has all namespaces and the force option is not enabled`, async () => {
+        const response = getMockGetResponse({ type: MULTI_NAMESPACE_TYPE, id, namespace });
+        response._source.namespaces = ['*'];
+        client.get.mockResolvedValueOnce(
+          elasticsearchClientMock.createSuccessTransportRequestPromise(response)
+        );
+        await expect(
+          savedObjectsRepository.delete(MULTI_NAMESPACE_TYPE, id, { namespace })
+        ).rejects.toThrowError(
+          'Unable to delete saved object that exists in multiple namespaces, use `force` option to delete it anyway'
+        );
+        expect(client.get).toHaveBeenCalledTimes(1);
+      });
+
       it(`throws when ES is unable to find the document during delete`, async () => {
         client.delete.mockResolvedValueOnce(
           elasticsearchClientMock.createSuccessTransportRequestPromise({ result: 'not_found' })
@@ -2252,7 +2315,7 @@ describe('SavedObjectsRepository', () => {
     });
 
     describe('errors', () => {
-      it(`throws when namespace is not a string`, async () => {
+      it(`throws when namespace is not a string or is '*'`, async () => {
         const test = async (namespace) => {
           await expect(savedObjectsRepository.deleteByNamespace(namespace)).rejects.toThrowError(
             `namespace is required, and must be a string`
@@ -2263,6 +2326,7 @@ describe('SavedObjectsRepository', () => {
         await test(['namespace']);
         await test(123);
         await test(true);
+        await test(ALL_NAMESPACES_STRING);
       });
     });
 
@@ -2802,6 +2866,12 @@ describe('SavedObjectsRepository', () => {
         );
       };
 
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.get(type, id, { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`throws when type is invalid`, async () => {
         await expectNotFoundError('unknownType', id);
         expect(client.get).not.toHaveBeenCalled();
@@ -2993,6 +3063,14 @@ describe('SavedObjectsRepository', () => {
         );
       };
 
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.incrementCounter(type, id, field, {
+            namespace: ALL_NAMESPACES_STRING,
+          })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`throws when type is not a string`, async () => {
         const test = async (type) => {
           await expect(
@@ -3649,6 +3727,12 @@ describe('SavedObjectsRepository', () => {
         );
       };
 
+      it(`throws when options.namespace is '*'`, async () => {
+        await expect(
+          savedObjectsRepository.update(type, id, attributes, { namespace: ALL_NAMESPACES_STRING })
+        ).rejects.toThrowError(createBadRequestError('"options.namespace" cannot be "*"'));
+      });
+
       it(`throws when type is invalid`, async () => {
         await expectNotFoundError('unknownType', id);
         expect(client.update).not.toHaveBeenCalled();
diff --git a/src/core/server/saved_objects/service/lib/repository.ts b/src/core/server/saved_objects/service/lib/repository.ts
index abeb2c2a7e577f2..0d69a00d8ae1c75 100644
--- a/src/core/server/saved_objects/service/lib/repository.ts
+++ b/src/core/server/saved_objects/service/lib/repository.ts
@@ -67,7 +67,7 @@ import {
 } from '../../types';
 import { SavedObjectTypeRegistry } from '../../saved_objects_type_registry';
 import { validateConvertFilterToKueryNode } from './filter_utils';
-import { SavedObjectsUtils } from './utils';
+import { ALL_NAMESPACES_STRING, SavedObjectsUtils } from './utils';
 
 // BEWARE: The SavedObjectClient depends on the implementation details of the SavedObjectsRepository
 // so any breaking changes to this repository are considered breaking changes to the SavedObjectsClient.
@@ -562,7 +562,10 @@ export class SavedObjectsRepository {
     if (this._registry.isMultiNamespace(type)) {
       preflightResult = await this.preflightCheckIncludesNamespace(type, id, namespace);
       const existingNamespaces = getSavedObjectNamespaces(undefined, preflightResult) ?? [];
-      if (!force && existingNamespaces.length > 1) {
+      if (
+        !force &&
+        (existingNamespaces.length > 1 || existingNamespaces.includes(ALL_NAMESPACES_STRING))
+      ) {
         throw SavedObjectsErrorHelpers.createBadRequestError(
           'Unable to delete saved object that exists in multiple namespaces, use `force` option to delete it anyway'
         );
@@ -610,8 +613,8 @@ export class SavedObjectsRepository {
     namespace: string,
     options: SavedObjectsDeleteByNamespaceOptions = {}
   ): Promise<any> {
-    if (!namespace || typeof namespace !== 'string') {
-      throw new TypeError(`namespace is required, and must be a string`);
+    if (!namespace || typeof namespace !== 'string' || namespace === '*') {
+      throw new TypeError(`namespace is required, and must be a string that is not equal to '*'`);
     }
 
     const allTypes = Object.keys(getRootPropertiesObjects(this._mappings));
@@ -1211,6 +1214,19 @@ export class SavedObjectsRepository {
       }
 
       const { attributes, references, version, namespace: objectNamespace } = object;
+
+      if (objectNamespace === ALL_NAMESPACES_STRING) {
+        return {
+          tag: 'Left' as 'Left',
+          error: {
+            id,
+            type,
+            error: errorContent(
+              SavedObjectsErrorHelpers.createBadRequestError('"namespace" cannot be "*"')
+            ),
+          },
+        };
+      }
       // `objectNamespace` is a namespace string, while `namespace` is a namespace ID.
       // The object namespace string, if defined, will supersede the operation's namespace ID.
 
@@ -1526,7 +1542,10 @@ export class SavedObjectsRepository {
     }
 
     const namespaces = raw._source.namespaces;
-    return namespaces?.includes(SavedObjectsUtils.namespaceIdToString(namespace)) ?? false;
+    const existsInNamespace =
+      namespaces?.includes(SavedObjectsUtils.namespaceIdToString(namespace)) ||
+      namespaces?.includes('*');
+    return existsInNamespace ?? false;
   }
 
   /**
@@ -1653,8 +1672,15 @@ function getSavedObjectNamespaces(
  * Ensure that a namespace is always in its namespace ID representation.
  * This allows `'default'` to be used interchangeably with `undefined`.
  */
-const normalizeNamespace = (namespace?: string) =>
-  namespace === undefined ? namespace : SavedObjectsUtils.namespaceStringToId(namespace);
+const normalizeNamespace = (namespace?: string) => {
+  if (namespace === ALL_NAMESPACES_STRING) {
+    throw SavedObjectsErrorHelpers.createBadRequestError('"options.namespace" cannot be "*"');
+  } else if (namespace === undefined) {
+    return namespace;
+  } else {
+    return SavedObjectsUtils.namespaceStringToId(namespace);
+  }
+};
 
 /**
  * Extracts the contents of a decorated error to return the attributes for bulk operations.
diff --git a/src/core/server/saved_objects/service/lib/search_dsl/query_params.test.ts b/src/core/server/saved_objects/service/lib/search_dsl/query_params.test.ts
index 85c47029e36d580..5a048e8f894b428 100644
--- a/src/core/server/saved_objects/service/lib/search_dsl/query_params.test.ts
+++ b/src/core/server/saved_objects/service/lib/search_dsl/query_params.test.ts
@@ -21,6 +21,7 @@
 import { esKuery, KueryNode } from '../../../../../../plugins/data/server';
 
 import { typeRegistryMock } from '../../../saved_objects_type_registry.mock';
+import { ALL_NAMESPACES_STRING } from '../utils';
 import { getQueryParams } from './query_params';
 
 const registry = typeRegistryMock.create();
@@ -199,9 +200,10 @@ describe('#getQueryParams', () => {
     describe('`namespaces` parameter', () => {
       const createTypeClause = (type: string, namespaces?: string[]) => {
         if (registry.isMultiNamespace(type)) {
+          const array = [...(namespaces ?? ['default']), ALL_NAMESPACES_STRING];
           return {
             bool: {
-              must: expect.arrayContaining([{ terms: { namespaces: namespaces ?? ['default'] } }]),
+              must: expect.arrayContaining([{ terms: { namespaces: array } }]),
               must_not: [{ exists: { field: 'namespace' } }],
             },
           };
diff --git a/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts b/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts
index 3ff72a86c2f8947..dc33db59258c0a3 100644
--- a/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts
+++ b/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts
@@ -21,7 +21,7 @@ import { esKuery, KueryNode } from '../../../../../../plugins/data/server';
 
 import { getRootPropertiesObjects, IndexMapping } from '../../../mappings';
 import { ISavedObjectTypeRegistry } from '../../../saved_objects_type_registry';
-import { DEFAULT_NAMESPACE_STRING } from '../utils';
+import { ALL_NAMESPACES_STRING, DEFAULT_NAMESPACE_STRING } from '../utils';
 
 /**
  * Gets the types based on the type. Uses mappings to support
@@ -83,7 +83,10 @@ function getClauseForType(
   if (registry.isMultiNamespace(type)) {
     return {
       bool: {
-        must: [{ term: { type } }, { terms: { namespaces } }],
+        must: [
+          { term: { type } },
+          { terms: { namespaces: [...namespaces, ALL_NAMESPACES_STRING] } },
+        ],
         must_not: [{ exists: { field: 'namespace' } }],
       },
     };
diff --git a/src/core/server/saved_objects/service/lib/utils.ts b/src/core/server/saved_objects/service/lib/utils.ts
index 6101ad57cc40107..0df0b3a5fd85da9 100644
--- a/src/core/server/saved_objects/service/lib/utils.ts
+++ b/src/core/server/saved_objects/service/lib/utils.ts
@@ -18,6 +18,7 @@
  */
 
 export const DEFAULT_NAMESPACE_STRING = 'default';
+export const ALL_NAMESPACES_STRING = '*';
 
 /**
  * @public
diff --git a/x-pack/plugins/spaces/server/lib/utils/namespace.ts b/x-pack/plugins/spaces/server/lib/utils/namespace.ts
index 344da18846f3b74..a34796d3720ae65 100644
--- a/x-pack/plugins/spaces/server/lib/utils/namespace.ts
+++ b/x-pack/plugins/spaces/server/lib/utils/namespace.ts
@@ -6,6 +6,8 @@
 
 import { SavedObjectsUtils } from '../../../../../../src/core/server';
 
+export const ALL_SPACES_STRING = '*';
+
 /**
  * Converts a Space ID string to its namespace ID representation. Note that a Space ID string is equivalent to a namespace string.
  *
diff --git a/x-pack/plugins/spaces/server/routes/api/external/share_add_spaces.ts b/x-pack/plugins/spaces/server/routes/api/external/share_add_spaces.ts
index ee61ccd2d5e4103..3f4e439a8d683e5 100644
--- a/x-pack/plugins/spaces/server/routes/api/external/share_add_spaces.ts
+++ b/x-pack/plugins/spaces/server/routes/api/external/share_add_spaces.ts
@@ -9,6 +9,7 @@ import { wrapError } from '../../../lib/errors';
 import { ExternalRouteDeps } from '.';
 import { SPACE_ID_REGEX } from '../../../lib/space_schema';
 import { createLicensedRouteHandler } from '../../lib';
+import { ALL_SPACES_STRING } from '../../../lib/utils/namespace';
 
 const uniq = <T>(arr: T[]): T[] => Array.from(new Set<T>(arr));
 export function initShareAddSpacesApi(deps: ExternalRouteDeps) {
@@ -22,8 +23,8 @@ export function initShareAddSpacesApi(deps: ExternalRouteDeps) {
           spaces: schema.arrayOf(
             schema.string({
               validate: (value) => {
-                if (!SPACE_ID_REGEX.test(value)) {
-                  return `lower case, a-z, 0-9, "_", and "-" are allowed`;
+                if (value !== ALL_SPACES_STRING && !SPACE_ID_REGEX.test(value)) {
+                  return `lower case, a-z, 0-9, "_", and "-" are allowed, OR "*"`;
                 }
               },
             }),
diff --git a/x-pack/plugins/spaces/server/routes/api/external/share_remove_spaces.ts b/x-pack/plugins/spaces/server/routes/api/external/share_remove_spaces.ts
index d03185ea7aa0954..e2e261ef5b8279a 100644
--- a/x-pack/plugins/spaces/server/routes/api/external/share_remove_spaces.ts
+++ b/x-pack/plugins/spaces/server/routes/api/external/share_remove_spaces.ts
@@ -9,6 +9,7 @@ import { wrapError } from '../../../lib/errors';
 import { ExternalRouteDeps } from '.';
 import { SPACE_ID_REGEX } from '../../../lib/space_schema';
 import { createLicensedRouteHandler } from '../../lib';
+import { ALL_SPACES_STRING } from '../../../lib/utils/namespace';
 
 const uniq = <T>(arr: T[]): T[] => Array.from(new Set<T>(arr));
 export function initShareRemoveSpacesApi(deps: ExternalRouteDeps) {
@@ -22,8 +23,8 @@ export function initShareRemoveSpacesApi(deps: ExternalRouteDeps) {
           spaces: schema.arrayOf(
             schema.string({
               validate: (value) => {
-                if (!SPACE_ID_REGEX.test(value)) {
-                  return `lower case, a-z, 0-9, "_", and "-" are allowed`;
+                if (value !== ALL_SPACES_STRING && !SPACE_ID_REGEX.test(value)) {
+                  return `lower case, a-z, 0-9, "_", and "-" are allowed, OR "*"`;
                 }
               },
             }),
diff --git a/x-pack/plugins/spaces/server/saved_objects/spaces_saved_objects_client.ts b/x-pack/plugins/spaces/server/saved_objects/spaces_saved_objects_client.ts
index 4e830d6149537c7..dfd1f5f0eafca20 100644
--- a/x-pack/plugins/spaces/server/saved_objects/spaces_saved_objects_client.ts
+++ b/x-pack/plugins/spaces/server/saved_objects/spaces_saved_objects_client.ts
@@ -19,7 +19,7 @@ import {
   ISavedObjectTypeRegistry,
 } from 'src/core/server';
 import { SpacesServiceSetup } from '../spaces_service/spaces_service';
-import { spaceIdToNamespace } from '../lib/utils/namespace';
+import { ALL_SPACES_STRING, spaceIdToNamespace } from '../lib/utils/namespace';
 import { SpacesClient } from '../lib/spaces_client';
 
 interface SpacesSavedObjectsClientOptions {
@@ -165,7 +165,7 @@ export class SpacesSavedObjectsClient implements SavedObjectsClientContract {
     if (namespaces) {
       const spacesClient = await this.getSpacesClient;
       const availableSpaces = await spacesClient.getAll('findSavedObjects');
-      if (namespaces.includes('*')) {
+      if (namespaces.includes(ALL_SPACES_STRING)) {
         namespaces = availableSpaces.map((space) => space.id);
       } else {
         namespaces = namespaces.filter((namespace) =>
diff --git a/x-pack/test/saved_object_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json b/x-pack/test/saved_object_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json
index 4c0447c29c8f9c1..d9d5c6f9c58081f 100644
--- a/x-pack/test/saved_object_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json
+++ b/x-pack/test/saved_object_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json
@@ -347,6 +347,23 @@
   }
 }
 
+{
+  "type": "doc",
+  "value": {
+    "id": "sharedtype:all_spaces",
+    "index": ".kibana",
+    "source": {
+      "sharedtype": {
+        "title": "A shared saved-object in all spaces"
+      },
+      "type": "sharedtype",
+      "namespaces": ["*"],
+      "updated_at": "2017-09-21T18:59:16.270Z"
+    },
+    "type": "doc"
+  }
+}
+
 {
   "type": "doc",
   "value": {
diff --git a/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_cases.ts b/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_cases.ts
index b32950538f8e531..2e747c7bcb20164 100644
--- a/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_cases.ts
+++ b/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_cases.ts
@@ -17,6 +17,10 @@ export const SAVED_OBJECT_TEST_CASES = Object.freeze({
     type: 'isolatedtype',
     id: 'space2-isolatedtype-id',
   }),
+  MULTI_NAMESPACE_ALL_SPACES: Object.freeze({
+    type: 'sharedtype',
+    id: 'all_spaces',
+  }),
   MULTI_NAMESPACE_DEFAULT_AND_SPACE_1: Object.freeze({
     type: 'sharedtype',
     id: 'default_and_space_1',
diff --git a/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_utils.ts b/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_utils.ts
index 595986c08efc1d3..61bac3d314c1b01 100644
--- a/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_utils.ts
+++ b/x-pack/test/saved_object_api_integration/common/lib/saved_object_test_utils.ts
@@ -16,6 +16,7 @@ const {
   SPACE_1: { spaceId: SPACE_1_ID },
   SPACE_2: { spaceId: SPACE_2_ID },
 } = SPACES;
+const ALL_SPACES = '*';
 const {
   NOT_A_KIBANA_USER,
   SUPERUSER,
@@ -170,6 +171,8 @@ export const expectResponses = {
     if (isMultiNamespace(type)) {
       if (['conflict_1', 'conflict_2a', 'conflict_2b', 'conflict_3', 'conflict_4a'].includes(id)) {
         expect(actualNamespaces).to.eql([DEFAULT_SPACE_ID, SPACE_1_ID, SPACE_2_ID]);
+      } else if (id === CASES.MULTI_NAMESPACE_ALL_SPACES.id) {
+        expect(actualNamespaces).to.eql([ALL_SPACES]);
       } else if (id === CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1.id) {
         expect(actualNamespaces).to.eql([DEFAULT_SPACE_ID, SPACE_1_ID]);
       } else if (id === CASES.MULTI_NAMESPACE_ONLY_SPACE_1.id) {
diff --git a/x-pack/test/saved_object_api_integration/common/suites/export.ts b/x-pack/test/saved_object_api_integration/common/suites/export.ts
index 4a8eff1fb380c07..eeaa78ef1878340 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/export.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/export.ts
@@ -72,14 +72,17 @@ export const getTestCases = (spaceId?: string): { [key: string]: ExportTestCase
   multiNamespaceType: {
     title: 'multi-namespace type',
     type: 'sharedtype',
-    successResult: (spaceId === SPACE_1_ID
-      ? [CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, CASES.MULTI_NAMESPACE_ONLY_SPACE_1]
-      : spaceId === SPACE_2_ID
-      ? [CASES.MULTI_NAMESPACE_ONLY_SPACE_2]
-      : [CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1]
-    )
-      .concat([CONFLICT_1_OBJ, CONFLICT_2A_OBJ, CONFLICT_2B_OBJ, CONFLICT_3_OBJ, CONFLICT_4A_OBJ])
-      .flat(),
+    successResult: [
+      CASES.MULTI_NAMESPACE_ALL_SPACES,
+      ...(spaceId === SPACE_1_ID
+        ? [CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, CASES.MULTI_NAMESPACE_ONLY_SPACE_1]
+        : spaceId === SPACE_2_ID
+        ? [CASES.MULTI_NAMESPACE_ONLY_SPACE_2]
+        : [CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1]
+      )
+        .concat([CONFLICT_1_OBJ, CONFLICT_2A_OBJ, CONFLICT_2B_OBJ, CONFLICT_3_OBJ, CONFLICT_4A_OBJ])
+        .flat(),
+    ],
   },
   namespaceAgnosticObject: {
     title: 'namespace-agnostic object',
diff --git a/x-pack/test/saved_object_api_integration/common/suites/find.ts b/x-pack/test/saved_object_api_integration/common/suites/find.ts
index bab4a4d88534a8a..42381b50a4dd936 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/find.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/find.ts
@@ -16,6 +16,7 @@ import { ExpectResponseBody, TestCase, TestDefinition, TestSuite, TestUser } fro
 const {
   DEFAULT: { spaceId: DEFAULT_SPACE_ID },
 } = SPACES;
+const ALL_SPACES = '*';
 
 export interface FindTestDefinition extends TestDefinition {
   request: { query: string };
@@ -74,6 +75,7 @@ const CONFLICT_4A_OBJ = Object.freeze({
 });
 
 const TEST_CASES = [
+  { ...CASES.MULTI_NAMESPACE_ALL_SPACES, namespaces: ['*'] },
   { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, namespaces: ['default'] },
   { ...CASES.SINGLE_NAMESPACE_SPACE_1, namespaces: ['space_1'] },
   { ...CASES.SINGLE_NAMESPACE_SPACE_2, namespaces: ['space_2'] },
@@ -118,12 +120,16 @@ export const getTestCases = (
       return TEST_CASES.filter((t) => {
         const hasOtherNamespaces =
           Array.isArray(t.namespaces) &&
-          t.namespaces!.some((ns) => ns !== (currentSpace ?? 'default'));
+          t.namespaces!.some((ns) => ns === ALL_SPACES || ns !== (currentSpace ?? 'default'));
         return hasOtherNamespaces && predicate(t);
       });
     }
     return TEST_CASES.filter(
-      (t) => (!t.namespaces || t.namespaces.includes(currentSpace ?? 'default')) && predicate(t)
+      (t) =>
+        (!t.namespaces ||
+          t.namespaces.includes(ALL_SPACES) ||
+          t.namespaces.includes(currentSpace ?? 'default')) &&
+        predicate(t)
     );
   };
 
@@ -254,7 +260,10 @@ export function findTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>)
           !user ||
           !so.namespaces ||
           so.namespaces.some(
-            (ns) => user.authorizedAtSpaces.includes(ns) || user.authorizedAtSpaces.includes('*')
+            (ns) =>
+              ns === ALL_SPACES ||
+              user.authorizedAtSpaces.includes(ns) ||
+              user.authorizedAtSpaces.includes('*')
           )
       );
       expect(response.body.page).to.eql(page);
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_create.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_create.ts
index 0cc5969e2b7ab03..d16fe5ab68e3455 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_create.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_create.ts
@@ -33,6 +33,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => {
     },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail409(!overwrite && spaceId === SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail409(!overwrite && spaceId === SPACE_2_ID) },
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail409(!overwrite || (spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_get.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_get.ts
index 4a35bdd03e4dd5d..4878d9d81dbf693 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_get.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_get.ts
@@ -28,6 +28,7 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_update.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_update.ts
index 1e11d1fc61110f4..3f4341de6cfc56f 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_update.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/bulk_update.ts
@@ -28,6 +28,7 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
@@ -44,6 +45,7 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, namespace: DEFAULT_SPACE_ID },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, namespace: SPACE_1_ID },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, namespace: SPACE_1_ID, ...fail404() }, // intentional 404 test case
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, namespace: DEFAULT_SPACE_ID }, // any spaceId will work (not '*')
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, namespace: DEFAULT_SPACE_ID }, // SPACE_1_ID would also work
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, namespace: SPACE_2_ID, ...fail404() }, // intentional 404 test case
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, namespace: SPACE_2_ID },
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/create.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/create.ts
index f81488603dc83e3..9ced649e5a12334 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/create.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/create.ts
@@ -31,6 +31,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => {
     },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail409(!overwrite && spaceId === SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail409(!overwrite && spaceId === SPACE_2_ID) },
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail409(!overwrite || (spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/delete.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/delete.ts
index eed67b6779679ba..436f09e8d2ee010 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/delete.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/delete.ts
@@ -28,6 +28,9 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail400() },
+    // try to delete this object again, this time using the `force` option
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, force: true },
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail400(spaceId === DEFAULT_SPACE_ID || spaceId === SPACE_1_ID),
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/get.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/get.ts
index dabe174af4d4be6..b554eb55b0adb1b 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/get.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/get.ts
@@ -28,6 +28,7 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/import.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/import.ts
index 0b531a3dccc1abd..a319a73c6a98ab4 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/import.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/import.ts
@@ -58,6 +58,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => {
   const group2 = [
     // when overwrite=true, all of the objects in this group are created successfully, so we can check the created object attributes
     CASES.NEW_MULTI_NAMESPACE_OBJ,
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail409(!overwrite && (spaceId === DEFAULT_SPACE_ID || spaceId === SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/resolve_import_errors.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/resolve_import_errors.ts
index 792fe63e5932d7d..b0f4f13f268c9e6 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/resolve_import_errors.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/resolve_import_errors.ts
@@ -55,6 +55,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => {
   const group1NonImportable = [{ ...CASES.HIDDEN, ...fail400() }];
   const group1All = [...group1Importable, ...group1NonImportable];
   const group2 = [
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail409(!overwrite && (spaceId === DEFAULT_SPACE_ID || spaceId === SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/update.ts b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/update.ts
index fec6f2b7de71545..a976ce08adb1f25 100644
--- a/x-pack/test/saved_object_api_integration/security_and_spaces/apis/update.ts
+++ b/x-pack/test/saved_object_api_integration/security_and_spaces/apis/update.ts
@@ -28,6 +28,7 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/bulk_create.ts b/x-pack/test/saved_object_api_integration/security_only/apis/bulk_create.ts
index 725120687c2313e..26a53fc50f92155 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/bulk_create.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/bulk_create.ts
@@ -23,6 +23,7 @@ const createTestCases = (overwrite: boolean) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail409(!overwrite) },
     CASES.SINGLE_NAMESPACE_SPACE_1,
     CASES.SINGLE_NAMESPACE_SPACE_2,
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, ...fail409(!overwrite) },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, ...fail409(), ...unresolvableConflict() },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, ...fail409(), ...unresolvableConflict() },
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/bulk_get.ts b/x-pack/test/saved_object_api_integration/security_only/apis/bulk_get.ts
index d305e08da1b3270..96eddf1f8bd3cc6 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/bulk_get.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/bulk_get.ts
@@ -22,6 +22,7 @@ const createTestCases = () => {
     CASES.SINGLE_NAMESPACE_DEFAULT_SPACE,
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404() },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404() },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, ...fail404() },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, ...fail404() },
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/bulk_update.ts b/x-pack/test/saved_object_api_integration/security_only/apis/bulk_update.ts
index 39ceb5a70d1b230..2a19c56f80ce6f0 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/bulk_update.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/bulk_update.ts
@@ -28,6 +28,7 @@ const createTestCases = () => {
     CASES.SINGLE_NAMESPACE_DEFAULT_SPACE,
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404() },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404() },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, ...fail404() },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, ...fail404() },
@@ -42,6 +43,7 @@ const createTestCases = () => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, namespace: DEFAULT_SPACE_ID },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, namespace: SPACE_1_ID },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, namespace: SPACE_1_ID, ...fail404() }, // intentional 404 test case
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, namespace: DEFAULT_SPACE_ID }, // any spaceId will work (not '*')
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, namespace: DEFAULT_SPACE_ID }, // SPACE_1_ID would also work
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, namespace: SPACE_2_ID, ...fail404() }, // intentional 404 test case
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, namespace: SPACE_2_ID },
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/create.ts b/x-pack/test/saved_object_api_integration/security_only/apis/create.ts
index 88d096f05d84661..be867d03aa51da2 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/create.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/create.ts
@@ -22,6 +22,7 @@ const createTestCases = (overwrite: boolean) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail409(!overwrite) },
     CASES.SINGLE_NAMESPACE_SPACE_1,
     CASES.SINGLE_NAMESPACE_SPACE_2,
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, ...fail409(!overwrite) },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, ...fail409() },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, ...fail409() },
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/delete.ts b/x-pack/test/saved_object_api_integration/security_only/apis/delete.ts
index f1aee480c106173..4caf112a59b272b 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/delete.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/delete.ts
@@ -22,6 +22,9 @@ const createTestCases = () => {
     CASES.SINGLE_NAMESPACE_DEFAULT_SPACE,
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404() },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404() },
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail400() },
+    // try to delete this object again, this time using the `force` option
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, force: true },
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, ...fail400() },
     // try to delete this object again, this time using the `force` option
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, force: true },
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/get.ts b/x-pack/test/saved_object_api_integration/security_only/apis/get.ts
index 0f105b939960f27..5eed2839b61722c 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/get.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/get.ts
@@ -22,6 +22,7 @@ const createTestCases = () => {
     CASES.SINGLE_NAMESPACE_DEFAULT_SPACE,
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404() },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404() },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, ...fail404() },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, ...fail404() },
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/import.ts b/x-pack/test/saved_object_api_integration/security_only/apis/import.ts
index 34be3b7408432a4..df763dba6d18abd 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/import.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/import.ts
@@ -49,6 +49,7 @@ const createTestCases = (overwrite: boolean) => {
   const group2 = [
     // when overwrite=true, all of the objects in this group are created successfully, so we can check the created object attributes
     CASES.NEW_MULTI_NAMESPACE_OBJ,
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, ...fail409(!overwrite) },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, ...destinationId() },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, ...destinationId() },
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/resolve_import_errors.ts b/x-pack/test/saved_object_api_integration/security_only/apis/resolve_import_errors.ts
index 91134dd14bd8a30..22734e95da0b590 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/resolve_import_errors.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/resolve_import_errors.ts
@@ -43,6 +43,7 @@ const createTestCases = (overwrite: boolean) => {
   const group1NonImportable = [{ ...CASES.HIDDEN, ...fail400() }];
   const group1All = [...group1Importable, ...group1NonImportable];
   const group2 = [
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, ...fail409(!overwrite) },
     { ...CASES.CONFLICT_1A_OBJ, ...newCopy() }, // "ambiguous source" conflict which results in a new destination ID and empty origin ID
     { ...CASES.CONFLICT_1B_OBJ, ...newCopy() }, // "ambiguous source" conflict which results in a new destination ID and empty origin ID
diff --git a/x-pack/test/saved_object_api_integration/security_only/apis/update.ts b/x-pack/test/saved_object_api_integration/security_only/apis/update.ts
index c1fd350101fd4e8..d6e22abf4af246c 100644
--- a/x-pack/test/saved_object_api_integration/security_only/apis/update.ts
+++ b/x-pack/test/saved_object_api_integration/security_only/apis/update.ts
@@ -22,6 +22,7 @@ const createTestCases = () => {
     CASES.SINGLE_NAMESPACE_DEFAULT_SPACE,
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404() },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404() },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, ...fail404() },
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, ...fail404() },
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_create.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_create.ts
index 74fade39bf7a580..457c3863d056000 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_create.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_create.ts
@@ -28,6 +28,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => [
   },
   { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail409(!overwrite && spaceId === SPACE_1_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail409(!overwrite && spaceId === SPACE_2_ID) },
+  { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
   {
     ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     ...fail409(!overwrite || (spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_get.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_get.ts
index 37bb2ec920c1e62..7eef9a95f523854 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_get.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_get.ts
@@ -22,6 +22,7 @@ const createTestCases = (spaceId: string) => [
   { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+  CASES.MULTI_NAMESPACE_ALL_SPACES,
   {
     ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_update.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_update.ts
index b51ec303fadf3f8..e789377b93fe161 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_update.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/bulk_update.ts
@@ -23,6 +23,7 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+    CASES.MULTI_NAMESPACE_ALL_SPACES,
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
@@ -39,6 +40,7 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, namespace: DEFAULT_SPACE_ID },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, namespace: SPACE_1_ID },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, namespace: SPACE_1_ID, ...fail404() }, // intentional 404 test case
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, namespace: spaceId }, // any spaceId will work (not '*')
     { ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1, namespace: DEFAULT_SPACE_ID }, // SPACE_1_ID would also work
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_1, namespace: SPACE_2_ID, ...fail404() }, // intentional 404 test case
     { ...CASES.MULTI_NAMESPACE_ONLY_SPACE_2, namespace: SPACE_2_ID },
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/create.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/create.ts
index 1040f7fd81ddee0..145630eb501ba05 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/create.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/create.ts
@@ -25,6 +25,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => [
   },
   { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail409(!overwrite && spaceId === SPACE_1_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail409(!overwrite && spaceId === SPACE_2_ID) },
+  { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
   {
     ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     ...fail409(!overwrite || (spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/delete.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/delete.ts
index eab089084ca9401..66309a4be446085 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/delete.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/delete.ts
@@ -22,6 +22,9 @@ const createTestCases = (spaceId: string) => [
   { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+  { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail400() },
+  // try to delete this object again, this time using the `force` option
+  { ...CASES.MULTI_NAMESPACE_ALL_SPACES, force: true },
   {
     ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     ...fail400(spaceId === DEFAULT_SPACE_ID || spaceId === SPACE_1_ID),
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/get.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/get.ts
index b0fed3e13b9af83..a56216537a365f6 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/get.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/get.ts
@@ -22,6 +22,7 @@ const createTestCases = (spaceId: string) => [
   { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+  CASES.MULTI_NAMESPACE_ALL_SPACES,
   {
     ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/import.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/import.ts
index a36249528540b86..3009fa0bd75a4d5 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/import.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/import.ts
@@ -44,6 +44,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => {
     },
     { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail409(!overwrite && spaceId === SPACE_1_ID) },
     { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail409(!overwrite && spaceId === SPACE_2_ID) },
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail409(!overwrite && (spaceId === DEFAULT_SPACE_ID || spaceId === SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/resolve_import_errors.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/resolve_import_errors.ts
index 1431a61b1cbe072..721a6b2bf710805 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/resolve_import_errors.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/resolve_import_errors.ts
@@ -48,6 +48,7 @@ const createTestCases = (overwrite: boolean, spaceId: string) => {
       : CASES.SINGLE_NAMESPACE_SPACE_2;
   return [
     { ...singleNamespaceObject, ...fail409(!overwrite) },
+    { ...CASES.MULTI_NAMESPACE_ALL_SPACES, ...fail409(!overwrite) },
     {
       ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
       ...fail409(!overwrite && (spaceId === DEFAULT_SPACE_ID || spaceId === SPACE_1_ID)),
diff --git a/x-pack/test/saved_object_api_integration/spaces_only/apis/update.ts b/x-pack/test/saved_object_api_integration/spaces_only/apis/update.ts
index 31ef6fb25b2f213..7a004290249ca63 100644
--- a/x-pack/test/saved_object_api_integration/spaces_only/apis/update.ts
+++ b/x-pack/test/saved_object_api_integration/spaces_only/apis/update.ts
@@ -22,6 +22,7 @@ const createTestCases = (spaceId: string) => [
   { ...CASES.SINGLE_NAMESPACE_DEFAULT_SPACE, ...fail404(spaceId !== DEFAULT_SPACE_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_1, ...fail404(spaceId !== SPACE_1_ID) },
   { ...CASES.SINGLE_NAMESPACE_SPACE_2, ...fail404(spaceId !== SPACE_2_ID) },
+  CASES.MULTI_NAMESPACE_ALL_SPACES,
   {
     ...CASES.MULTI_NAMESPACE_DEFAULT_AND_SPACE_1,
     ...fail404(spaceId !== DEFAULT_SPACE_ID && spaceId !== SPACE_1_ID),
diff --git a/x-pack/test/spaces_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json b/x-pack/test/spaces_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json
index 7e528c23c20a05b..5ce6c0ce6b7c5b1 100644
--- a/x-pack/test/spaces_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json
+++ b/x-pack/test/spaces_api_integration/common/fixtures/es_archiver/saved_objects/spaces/data.json
@@ -482,7 +482,7 @@
 {
   "type": "doc",
   "value": {
-    "id": "sharedtype:all_spaces",
+    "id": "sharedtype:each_space",
     "index": ".kibana",
     "source": {
       "sharedtype": {
@@ -496,6 +496,23 @@
   }
 }
 
+{
+  "type": "doc",
+  "value": {
+    "id": "sharedtype:all_spaces",
+    "index": ".kibana",
+    "source": {
+      "sharedtype": {
+        "title": "A shared saved-object in all spaces"
+      },
+      "type": "sharedtype",
+      "namespaces": ["*"],
+      "updated_at": "2017-09-21T18:59:16.270Z"
+    },
+    "type": "doc"
+  }
+}
+
 {
   "type": "doc",
   "value": {
diff --git a/x-pack/test/spaces_api_integration/common/lib/saved_object_test_cases.ts b/x-pack/test/spaces_api_integration/common/lib/saved_object_test_cases.ts
index 3b0f5f8570aa323..9b8baa7f22a2bb6 100644
--- a/x-pack/test/spaces_api_integration/common/lib/saved_object_test_cases.ts
+++ b/x-pack/test/spaces_api_integration/common/lib/saved_object_test_cases.ts
@@ -29,9 +29,13 @@ export const MULTI_NAMESPACE_SAVED_OBJECT_TEST_CASES = Object.freeze({
     id: 'space_1_and_space_2',
     existingNamespaces: ['space_1', 'space_2'],
   }),
+  EACH_SPACE: Object.freeze({
+    id: 'each_space',
+    existingNamespaces: ['default', 'space_1', 'space_2'], // each individual space
+  }),
   ALL_SPACES: Object.freeze({
     id: 'all_spaces',
-    existingNamespaces: ['default', 'space_1', 'space_2'],
+    existingNamespaces: ['*'], // all current and future spaces
   }),
   DOES_NOT_EXIST: Object.freeze({
     id: 'does_not_exist',
diff --git a/x-pack/test/spaces_api_integration/common/suites/copy_to_space.ts b/x-pack/test/spaces_api_integration/common/suites/copy_to_space.ts
index 26c736034501f75..ee7a2fb7316571c 100644
--- a/x-pack/test/spaces_api_integration/common/suites/copy_to_space.ts
+++ b/x-pack/test/spaces_api_integration/common/suites/copy_to_space.ts
@@ -423,7 +423,7 @@ export function copyToSpaceTestSuiteFactory(
     const type = 'sharedtype';
     const v4 = new RegExp(/^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i);
     const noConflictId = `${spaceId}_only`;
-    const exactMatchId = 'all_spaces';
+    const exactMatchId = 'each_space';
     const inexactMatchId = `conflict_1_${spaceId}`;
     const ambiguousConflictId = `conflict_2_${spaceId}`;
 
diff --git a/x-pack/test/spaces_api_integration/common/suites/resolve_copy_to_space_conflicts.ts b/x-pack/test/spaces_api_integration/common/suites/resolve_copy_to_space_conflicts.ts
index cb9219b1ba2ed83..eba7e2033eadf23 100644
--- a/x-pack/test/spaces_api_integration/common/suites/resolve_copy_to_space_conflicts.ts
+++ b/x-pack/test/spaces_api_integration/common/suites/resolve_copy_to_space_conflicts.ts
@@ -310,7 +310,7 @@ export function resolveCopyToSpaceConflictsSuite(
     // a 403 error actually comes back as an HTTP 200 response
     const statusCode = outcome === 'noAccess' ? 404 : 200;
     const type = 'sharedtype';
-    const exactMatchId = 'all_spaces';
+    const exactMatchId = 'each_space';
     const inexactMatchId = `conflict_1_${spaceId}`;
     const ambiguousConflictId = `conflict_2_${spaceId}`;
 
diff --git a/x-pack/test/spaces_api_integration/common/suites/share_add.ts b/x-pack/test/spaces_api_integration/common/suites/share_add.ts
index 219190cb2800296..54d636c938b580a 100644
--- a/x-pack/test/spaces_api_integration/common/suites/share_add.ts
+++ b/x-pack/test/spaces_api_integration/common/suites/share_add.ts
@@ -26,7 +26,6 @@ export interface ShareAddTestCase {
   id: string;
   namespaces: string[];
   failure?: 400 | 403 | 404;
-  fail400Param?: string;
   fail403Param?: string;
 }
 
@@ -42,19 +41,12 @@ export function shareAddTestSuiteFactory(esArchiver: any, supertest: SuperTest<a
   const expectResponseBody = (testCase: ShareAddTestCase): ExpectResponseBody => async (
     response: Record<string, any>
   ) => {
-    const { id, failure, fail400Param, fail403Param } = testCase;
+    const { id, failure, fail403Param } = testCase;
     const object = response.body;
     if (failure === 403) {
       await expectResponses.forbiddenTypes(fail403Param!)(TYPE)(response);
-    } else if (failure) {
-      let error: any;
-      if (failure === 400) {
-        error = SavedObjectsErrorHelpers.createBadRequestError(
-          `${id} already exists in the following namespace(s): ${fail400Param}`
-        );
-      } else if (failure === 404) {
-        error = SavedObjectsErrorHelpers.createGenericNotFoundError(TYPE, id);
-      }
+    } else if (failure === 404) {
+      const error = SavedObjectsErrorHelpers.createGenericNotFoundError(TYPE, id);
       expect(object.error).to.eql(error.output.payload.error);
       expect(object.statusCode).to.eql(error.output.payload.statusCode);
     } else {
diff --git a/x-pack/test/spaces_api_integration/common/suites/share_remove.ts b/x-pack/test/spaces_api_integration/common/suites/share_remove.ts
index 0748aa797264cb9..0169d4eb4c64bc9 100644
--- a/x-pack/test/spaces_api_integration/common/suites/share_remove.ts
+++ b/x-pack/test/spaces_api_integration/common/suites/share_remove.ts
@@ -27,7 +27,6 @@ export interface ShareRemoveTestCase {
   id: string;
   namespaces: string[];
   failure?: 400 | 403 | 404;
-  fail400Param?: string;
 }
 
 const TYPE = 'sharedtype';
@@ -41,19 +40,12 @@ export function shareRemoveTestSuiteFactory(esArchiver: any, supertest: SuperTes
   const expectResponseBody = (testCase: ShareRemoveTestCase): ExpectResponseBody => async (
     response: Record<string, any>
   ) => {
-    const { id, failure, fail400Param } = testCase;
+    const { id, failure } = testCase;
     const object = response.body;
     if (failure === 403) {
       await expectForbidden(TYPE)(response);
-    } else if (failure) {
-      let error: any;
-      if (failure === 400) {
-        error = SavedObjectsErrorHelpers.createBadRequestError(
-          `${id} doesn't exist in the following namespace(s): ${fail400Param}`
-        );
-      } else if (failure === 404) {
-        error = SavedObjectsErrorHelpers.createGenericNotFoundError(TYPE, id);
-      }
+    } else if (failure === 404) {
+      const error = SavedObjectsErrorHelpers.createGenericNotFoundError(TYPE, id);
       expect(object.error).to.eql(error.output.payload.error);
       expect(object.statusCode).to.eql(error.output.payload.statusCode);
     } else {
diff --git a/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_add.ts b/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_add.ts
index ddd029c8d7d687e..937aaff05958016 100644
--- a/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_add.ts
+++ b/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_add.ts
@@ -12,7 +12,11 @@ import {
 import { TestUser } from '../../../saved_object_api_integration/common/lib/types';
 import { MULTI_NAMESPACE_SAVED_OBJECT_TEST_CASES as CASES } from '../../common/lib/saved_object_test_cases';
 import { TestInvoker } from '../../common/lib/types';
-import { shareAddTestSuiteFactory, ShareAddTestDefinition } from '../../common/suites/share_add';
+import {
+  shareAddTestSuiteFactory,
+  ShareAddTestDefinition,
+  ShareAddTestCase,
+} from '../../common/suites/share_add';
 
 const {
   DEFAULT: { spaceId: DEFAULT_SPACE_ID },
@@ -33,6 +37,8 @@ const createTestCases = (spaceId: string) => {
     { ...CASES.SPACE_1_AND_SPACE_2, namespaces, ...fail404(spaceId === DEFAULT_SPACE_ID) },
     { ...CASES.ALL_SPACES, namespaces },
     { ...CASES.DOES_NOT_EXIST, namespaces, ...fail404() },
+    // Test case to check adding all spaces ("*") to a saved object
+    { ...CASES.EACH_SPACE, namespaces: ['*'] },
     // Test cases to check adding multiple namespaces to different saved objects that exist in one space
     // These are non-exhaustive, they only check cases for adding two additional namespaces to a saved object
     // More permutations are covered in the corresponding spaces_only test suite
@@ -57,13 +63,24 @@ const calculateSingleSpaceAuthZ = (
   testCases: ReturnType<typeof createTestCases>,
   spaceId: string
 ) => {
-  const targetsOtherSpace = testCases.filter(
-    (x) => !x.namespaces.includes(spaceId) || x.namespaces.length > 1
-  );
-  const tmp = testCases.filter((x) => !targetsOtherSpace.includes(x)); // doesn't target other space
-  const doesntExistInThisSpace = tmp.filter((x) => !x.existingNamespaces.includes(spaceId));
-  const existsInThisSpace = tmp.filter((x) => x.existingNamespaces.includes(spaceId));
-  return { targetsOtherSpace, doesntExistInThisSpace, existsInThisSpace };
+  const targetsAllSpaces: ShareAddTestCase[] = [];
+  const targetsOtherSpace: ShareAddTestCase[] = [];
+  const doesntExistInThisSpace: ShareAddTestCase[] = [];
+  const existsInThisSpace: ShareAddTestCase[] = [];
+
+  for (const testCase of testCases) {
+    const { namespaces, existingNamespaces } = testCase;
+    if (namespaces.includes('*')) {
+      targetsAllSpaces.push(testCase);
+    } else if (!namespaces.includes(spaceId) || namespaces.length > 1) {
+      targetsOtherSpace.push(testCase);
+    } else if (!existingNamespaces.includes(spaceId)) {
+      doesntExistInThisSpace.push(testCase);
+    } else {
+      existsInThisSpace.push(testCase);
+    }
+  }
+  return { targetsAllSpaces, targetsOtherSpace, doesntExistInThisSpace, existsInThisSpace };
 };
 // eslint-disable-next-line import/no-default-export
 export default function ({ getService }: TestInvoker) {
@@ -79,11 +96,13 @@ export default function ({ getService }: TestInvoker) {
     return {
       unauthorized: createTestDefinitions(testCases, true, { fail403Param: 'create' }),
       authorizedInSpace: [
+        createTestDefinitions(thisSpace.targetsAllSpaces, true, { fail403Param: 'create' }),
         createTestDefinitions(thisSpace.targetsOtherSpace, true, { fail403Param: 'create' }),
         createTestDefinitions(thisSpace.doesntExistInThisSpace, false),
         createTestDefinitions(thisSpace.existsInThisSpace, false),
       ].flat(),
       authorizedInOtherSpace: [
+        createTestDefinitions(thisSpace.targetsAllSpaces, true, { fail403Param: 'create' }),
         createTestDefinitions(otherSpace.targetsOtherSpace, true, { fail403Param: 'create' }),
         // If the preflight GET request fails, it will return a 404 error; users who are authorized to create saved objects in the target
         // space(s) but are not authorized to update saved objects in this space will see a 403 error instead of 404. This is a safeguard to
diff --git a/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_remove.ts b/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_remove.ts
index 4b120a71213b756..34406d3258aa415 100644
--- a/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_remove.ts
+++ b/x-pack/test/spaces_api_integration/security_and_spaces/apis/share_remove.ts
@@ -35,16 +35,20 @@ const createTestCases = (spaceId: string) => {
     { id: CASES.DEFAULT_AND_SPACE_1.id, namespaces, ...fail404(spaceId === SPACE_2_ID) },
     { id: CASES.DEFAULT_AND_SPACE_2.id, namespaces, ...fail404(spaceId === SPACE_1_ID) },
     { id: CASES.SPACE_1_AND_SPACE_2.id, namespaces, ...fail404(spaceId === DEFAULT_SPACE_ID) },
-    { id: CASES.ALL_SPACES.id, namespaces },
+    { id: CASES.EACH_SPACE.id, namespaces },
     { id: CASES.DOES_NOT_EXIST.id, namespaces, ...fail404() },
   ] as ShareRemoveTestCase[];
 
-  // Test cases to check removing all three namespaces from different saved objects that exist in two spaces
-  // These are non-exhaustive, they only check some cases -- each object will result in a 404, either because
-  // it never existed in the target namespace, or it was removed in one of the test cases above
-  // More permutations are covered in the corresponding spaces_only test suite
   namespaces = [DEFAULT_SPACE_ID, SPACE_1_ID, SPACE_2_ID];
   const multipleSpaces = [
+    // Test case to check removing all spaces from a saved object that exists in all spaces;
+    // It fails the second time because the object no longer exists
+    { ...CASES.ALL_SPACES, namespaces: ['*'] },
+    { ...CASES.ALL_SPACES, namespaces: ['*'], ...fail404() },
+    // Test cases to check removing all three namespaces from different saved objects that exist in two spaces
+    // These are non-exhaustive, they only check some cases -- each object will result in a 404, either because
+    // it never existed in the target namespace, or it was removed in one of the test cases above
+    // More permutations are covered in the corresponding spaces_only test suite
     { id: CASES.DEFAULT_AND_SPACE_1.id, namespaces, ...fail404() },
     { id: CASES.DEFAULT_AND_SPACE_2.id, namespaces, ...fail404() },
     { id: CASES.SPACE_1_AND_SPACE_2.id, namespaces, ...fail404() },
diff --git a/x-pack/test/spaces_api_integration/spaces_only/apis/share_add.ts b/x-pack/test/spaces_api_integration/spaces_only/apis/share_add.ts
index 25ba986a12fd887..8b8e449b3c323a5 100644
--- a/x-pack/test/spaces_api_integration/spaces_only/apis/share_add.ts
+++ b/x-pack/test/spaces_api_integration/spaces_only/apis/share_add.ts
@@ -33,6 +33,7 @@ const createSingleTestCases = (spaceId: string) => {
     { ...CASES.DEFAULT_AND_SPACE_1, namespaces, ...fail404(spaceId === SPACE_2_ID) },
     { ...CASES.DEFAULT_AND_SPACE_2, namespaces, ...fail404(spaceId === SPACE_1_ID) },
     { ...CASES.SPACE_1_AND_SPACE_2, namespaces, ...fail404(spaceId === DEFAULT_SPACE_ID) },
+    { ...CASES.EACH_SPACE, namespaces },
     { ...CASES.ALL_SPACES, namespaces },
     { ...CASES.DOES_NOT_EXIST, namespaces, ...fail404() },
   ];
@@ -42,14 +43,26 @@ const createSingleTestCases = (spaceId: string) => {
  * These are non-exhaustive, but they check different permutations of saved objects and spaces to add
  */
 const createMultiTestCases = () => {
-  const allSpaces = [DEFAULT_SPACE_ID, SPACE_1_ID, SPACE_2_ID];
-  let id = CASES.DEFAULT_ONLY.id;
-  const one = [{ id, namespaces: allSpaces }];
-  id = CASES.DEFAULT_AND_SPACE_1.id;
-  const two = [{ id, namespaces: allSpaces }];
-  id = CASES.ALL_SPACES.id;
-  const three = [{ id, namespaces: allSpaces }];
-  return { one, two, three };
+  const eachSpace = [DEFAULT_SPACE_ID, SPACE_1_ID, SPACE_2_ID];
+  const allSpaces = ['*'];
+  // for each of the cases below, test adding each space and all spaces to the object
+  const one = [
+    { id: CASES.DEFAULT_ONLY.id, namespaces: eachSpace },
+    { id: CASES.DEFAULT_ONLY.id, namespaces: allSpaces },
+  ];
+  const two = [
+    { id: CASES.DEFAULT_AND_SPACE_1.id, namespaces: eachSpace },
+    { id: CASES.DEFAULT_AND_SPACE_1.id, namespaces: allSpaces },
+  ];
+  const three = [
+    { id: CASES.EACH_SPACE.id, namespaces: eachSpace },
+    { id: CASES.EACH_SPACE.id, namespaces: allSpaces },
+  ];
+  const four = [
+    { id: CASES.ALL_SPACES.id, namespaces: eachSpace },
+    { id: CASES.ALL_SPACES.id, namespaces: allSpaces },
+  ];
+  return { one, two, three, four };
 };
 
 // eslint-disable-next-line import/no-default-export
@@ -68,6 +81,7 @@ export default function ({ getService }: TestInvoker) {
       one: createTestDefinitions(testCases.one, false),
       two: createTestDefinitions(testCases.two, false),
       three: createTestDefinitions(testCases.three, false),
+      four: createTestDefinitions(testCases.four, false),
     };
   };
 
@@ -76,9 +90,10 @@ export default function ({ getService }: TestInvoker) {
       const tests = createSingleTests(spaceId);
       addTests(`targeting the ${spaceId} space`, { spaceId, tests });
     });
-    const { one, two, three } = createMultiTests();
+    const { one, two, three, four } = createMultiTests();
     addTests('for a saved object in the default space', { tests: one });
     addTests('for a saved object in the default and space_1 spaces', { tests: two });
     addTests('for a saved object in the default, space_1, and space_2 spaces', { tests: three });
+    addTests('for a saved object in all spaces', { tests: four });
   });
 }
diff --git a/x-pack/test/spaces_api_integration/spaces_only/apis/share_remove.ts b/x-pack/test/spaces_api_integration/spaces_only/apis/share_remove.ts
index 2c4506b7235339e..bb0e6f858cbab75 100644
--- a/x-pack/test/spaces_api_integration/spaces_only/apis/share_remove.ts
+++ b/x-pack/test/spaces_api_integration/spaces_only/apis/share_remove.ts
@@ -33,7 +33,7 @@ const createSingleTestCases = (spaceId: string) => {
     { ...CASES.DEFAULT_AND_SPACE_1, namespaces, ...fail404(spaceId === SPACE_2_ID) },
     { ...CASES.DEFAULT_AND_SPACE_2, namespaces, ...fail404(spaceId === SPACE_1_ID) },
     { ...CASES.SPACE_1_AND_SPACE_2, namespaces, ...fail404(spaceId === DEFAULT_SPACE_ID) },
-    { ...CASES.ALL_SPACES, namespaces },
+    { ...CASES.EACH_SPACE, namespaces },
     { ...CASES.DOES_NOT_EXIST, namespaces, ...fail404() },
   ];
 };
@@ -56,7 +56,7 @@ const createMultiTestCases = () => {
     { id, namespaces: [DEFAULT_SPACE_ID], ...fail404() }, // this object's namespaces no longer contains DEFAULT_SPACE_ID
     { id, namespaces: [SPACE_1_ID], ...fail404() }, // this object's namespaces does contain SPACE_1_ID
   ];
-  id = CASES.ALL_SPACES.id;
+  id = CASES.EACH_SPACE.id;
   const three = [
     { id, namespaces: [DEFAULT_SPACE_ID, SPACE_1_ID, nonExistentSpaceId] },
     // this saved object will not be found in the context of the current namespace ('default')
@@ -64,7 +64,15 @@ const createMultiTestCases = () => {
     { id, namespaces: [SPACE_1_ID], ...fail404() }, // this object's namespaces no longer contains SPACE_1_ID
     { id, namespaces: [SPACE_2_ID], ...fail404() }, // this object's namespaces does contain SPACE_2_ID
   ];
-  return { one, two, three };
+  id = CASES.ALL_SPACES.id;
+  const four = [
+    { id, namespaces: [DEFAULT_SPACE_ID, SPACE_1_ID, nonExistentSpaceId] },
+    // this saved object will still be found in the context of the current namespace ('default')
+    { id, namespaces: ['*'] },
+    // this object no longer exists
+    { id, namespaces: ['*'], ...fail404() },
+  ];
+  return { one, two, three, four };
 };
 
 // eslint-disable-next-line import/no-default-export
@@ -83,6 +91,7 @@ export default function ({ getService }: TestInvoker) {
       one: createTestDefinitions(testCases.one, false),
       two: createTestDefinitions(testCases.two, false),
       three: createTestDefinitions(testCases.three, false),
+      four: createTestDefinitions(testCases.four, false),
     };
   };
 
@@ -91,9 +100,10 @@ export default function ({ getService }: TestInvoker) {
       const tests = createSingleTests(spaceId);
       addTests(`targeting the ${spaceId} space`, { spaceId, tests });
     });
-    const { one, two, three } = createMultiTests();
+    const { one, two, three, four } = createMultiTests();
     addTests('for a saved object in the default space', { tests: one });
     addTests('for a saved object in the default and space_1 spaces', { tests: two });
     addTests('for a saved object in the default, space_1, and space_2 spaces', { tests: three });
+    addTests('for a saved object in all spaces', { tests: four });
   });
 }