The bt_bb_get_grid AJAX action of the Bold Page Builder WordPress plugin before 3.1.6 passes user input into the unserialize() function without any validation or sanitisation, which could lead to a PHP Object Injection. Even though the plugin did not contain a suitable gadget to fully exploit the issue, other installed plugins on the blog could allow such issue to be exploited and lead to RCE in some cases.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-24579
• https://wpscan.com/vulnerability/08edce3f-2746-4886-8439-76e44ec76fa8