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Vulnerability record · CVE-2021-24217 · published 12 April 2021

CVE-2021-24217: Facebook deserialization of untrusted data vulnerability

Facebook · Facebook

The run_action function of the Facebook for WordPress plugin before 3.0.0 deserializes user supplied data making it possible for PHP objects to be supplied creating an Object Injection vulnerability. There was also a useable magic method in the plugin that could be used to achieve remote code execution.

8.1 CVSS 3.1 High EPSS 3.5% · top 11.2% CWE-502 · Deserialization of untrusted data
8.1CVSS 3.1 base score, v2 6.8
3.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

The run_action function of the Facebook for WordPress plugin before 3.0.0 deserializes user supplied data making it possible for PHP objects to be supplied creating an Object Injection vulnerability. There was also a useable magic method in the plugin that could be used to achieve remote code execution.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wpscan.com/vulnerability/509f2754-a1a1-4142-9126-ae023a88533a ExploitThird Party Advisory
https://www.wordfence.com/blog/2021/03/two-vulnerabilities-patched-in-facebook-for-wordpress-plugin/ ExploitThird Party Advisory
https://wpscan.com/vulnerability/509f2754-a1a1-4142-9126-ae023a88533a ExploitThird Party Advisory
https://www.wordfence.com/blog/2021/03/two-vulnerabilities-patched-in-facebook-for-wordpress-plugin/ ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-24217), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.