The joomsport_md_load AJAX action of the JoomSport WordPress plugin before 5.1.8, registered for both unauthenticated and unauthenticated users, unserialised user input from the shattr POST parameter, leading to a PHP Object Injection issue. Even though the plugin does not have a suitable gadget chain to exploit this, other installed plugins could, which might lead to more severe issues such as RCE

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-24384
• https://wpscan.com/vulnerability/fb6c407c-713c-4e83-92ce-4e5f791be696