CVE-2024-3559: Custom Field Suite <= 2.6.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via cfs[post_content]

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-12 · updated 2026-06-17
Weakness: CWE-79

Description

The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post_content]' parameter versions up to, and including, 2.6.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

mgibbs189 Custom Field Suite: through 2.6.7

References

https://plugins.trac.wordpress.org/browser/custom-field-suite/trunk/includes/api.php#L282
https://plugins.trac.wordpress.org/browser/custom-field-suite/trunk/includes/form.php#L69
https://www.wordfence.com/threat-intel/vulnerabilities/id/56d8af3b-6c00-49ed-872a-64f7bebb470b?source=cve
https://plugins.trac.wordpress.org/browser/custom-field-suite/trunk/includes/api.php#L282
https://plugins.trac.wordpress.org/browser/custom-field-suite/trunk/includes/form.php#L69
https://www.wordfence.com/threat-intel/vulnerabilities/id/56d8af3b-6c00-49ed-872a-64f7bebb470b?source=cve

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