Bold Page Builder < 3.1.6 - PHP Object Injection

published 2021-08-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11491

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 8.2%; EPSS 8.2% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

bold-themes bold_page_builder 3.1.6

Exploit prediction

8.21% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

wpscan.com https://wpscan.com/vulnerability/08edce3f-2746-4886-8439-76e44ec76fa8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

Unknown Bold Page Builder

Classification

Weakness

CWE-502 Deserialization of Untrusted Data

Technology feeds

WordPress rss critical rss

References

wpscan.com /vulnerability/08edce3f-2746-4886-8439-76e44ec76fa8
exploit, third-party-advisory

Sources

CVE List CVE-2021-24579
NVD CVE-2021-24579

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary