CVE-2021-24579: Bold Page Builder < 3.1.6 - PHP Object Injection

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 8.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-08-30 · updated 2026-06-17
Weakness: CWE-502

Description

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.

Affected products

boldthemes Bold Page Builder: before 3.1.6 — fixed in 3.1.6

How to fix

Upgrade to a fixed version: boldthemes Bold Page Builder 3.1.6. Check the vendor advisory for mitigations.

References

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