chsxf mCatFilter Plugin up to 0.5.2 on WordPress compute_post cross-site request forgery

Summaryinfo

A vulnerability categorized as problematic has been discovered in chsxf mCatFilter Plugin up to 0.5.2 on WordPress. Impacted is the function compute_post. Such manipulation leads to cross-site request forgery. This vulnerability is traded as CVE-2026-4139. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in chsxf mCatFilter Plugin up to 0.5.2 on WordPress. Affected by this issue is the function compute_post. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. Using CWE to declare the problem leads to CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. Impacted is integrity. CVE summarizes:

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.

The weakness was shared by Muhammad Afnaan. The advisory is available at wordfence.com. This vulnerability is handled as CVE-2026-4139 since 03/13/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• chsxf

Name

• mCatFilter Plugin

Version

• 0.5.0
• 0.5.1
• 0.5.2

CPE 2.3info

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CPE 2.2info

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