CVE-2026-4139

Vulnerability Description

The mCatFilter plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 0.5.2. This is due to the complete absence of nonce verification and capability checks in the compute_post() function, which processes settings updates. The compute_post() function is called in the plugin constructor on every page load via the plugins_loaded hook, and it directly processes $_POST data to modify plugin settings via update_option() without any CSRF token validation. This makes it possible for unauthenticated attackers to modify all plugin settings, including category exclusion rules, feed exclusion flags, and tag page exclusion flags, via a forged POST request, granted they can trick a site administrator into performing an action such as clicking a link.

CVSS Score

Related Weaknesses (CWE)

References

• https://plugins.trac.wordpress.org/browser/mcatfilter/tags/0.5.2/mcatfilter.php#
• https://plugins.trac.wordpress.org/browser/mcatfilter/tags/0.5.2/mcatfilter.php#
• https://plugins.trac.wordpress.org/browser/mcatfilter/tags/0.5.2/mcatfilter.php#
• https://plugins.trac.wordpress.org/browser/mcatfilter/trunk/mcatfilter.php#L138
• https://plugins.trac.wordpress.org/browser/mcatfilter/trunk/mcatfilter.php#L320
• https://plugins.trac.wordpress.org/browser/mcatfilter/trunk/mcatfilter.php#L339
• https://www.wordfence.com/threat-intel/vulnerabilities/id/622ee6c8-7739-44ae-b88