CVE-2026-4139
mCatFilter <= 0.5.2 - Cross-Site Request Forgery via compute_post() Function
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.
INFO
Published Date :
April 22, 2026, 9:16 a.m.
Last Modified :
April 22, 2026, 9:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-4139
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the mCatFilter plugin to the latest version.
- Verify nonce verification and capability checks are enabled.
- Avoid processing user input without validation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-4139.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-4139 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-4139
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-4139 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-4139 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Added CWE CWE-352 Added Reference https://plugins.trac.wordpress.org/browser/mcatfilter/tags/0.5.2/mcatfilter.php#L138 Added Reference https://plugins.trac.wordpress.org/browser/mcatfilter/tags/0.5.2/mcatfilter.php#L320 Added Reference https://plugins.trac.wordpress.org/browser/mcatfilter/tags/0.5.2/mcatfilter.php#L339 Added Reference https://plugins.trac.wordpress.org/browser/mcatfilter/trunk/mcatfilter.php#L138 Added Reference https://plugins.trac.wordpress.org/browser/mcatfilter/trunk/mcatfilter.php#L320 Added Reference https://plugins.trac.wordpress.org/browser/mcatfilter/trunk/mcatfilter.php#L339 Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/622ee6c8-7739-44ae-b88f-63a93c0a9b20?source=cve