Exploit discussion active in current signal (1 latest mentions)
Recommended action window: High priority (within 72h)
NVD 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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-04-22 | 1 | Disclosure1 |
| 2026-04-23 | 1 | Disclosure1 |
| 2026-04-26 | 1 | PoC1 |
https://atomicedge.io/cve-proof/cve-2026-4139-mcatfilter-version-0-5-2-medium-vulnerability-proof-of-concept CVE-2026-4139 #WordPress plugin #vulnerability mcatfilter #cybersecurity #wordpressfirewall #wordpresssecurity #hacking #wpsecurity #atomicedge
Post summary
The post shares a link to a proof‑of‑concept demonstrating a medium‑severity vulnerability (CVE‑2026‑4139) in the mcatfilter WordPress plugin.
CVE-2026-4139 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 … https://www.cve.org/CVERecord?id=CVE-2026-4139
Post summary
The mCatFilter WordPress plugin is vulnerable to CSRF because it lacks nonce validation in all versions up to 0.5.2 (CVE‑2026‑4139). No exploit, patch, or active misuse information is provided.
CVE-2026-4139 Cross-Site Request Forgery in mCatFilter Plugin for WordPress Up to 0.5.2 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-4139 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3
Post summary
The text announces a newly disclosed CSRF vulnerability affecting the mCatFilter WordPress plugin, providing basic technical details but no evidence of exploitation or mitigation.