Vulnerability Description
The OPEN-BRAIN plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 0.5.0. This is due to missing nonce verification on the settings form in the func_page_main() function. This makes it possible for unauthenticated attackers to inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L237
- https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L252
- https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L253
- https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L272
- https://plugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L237
- https://plugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L252
- https://plugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L253
- https://plugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L272
- https://www.wordfence.com/threat-intel/vulnerabilities/id/93df6480-9bb1-4f5d-bb3
FAQ
What is CVE-2026-4091?
CVE-2026-4091 is a vulnerability with a CVSS score of 6.1 (MEDIUM). The OPEN-BRAIN plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 0.5.0. This is due to missing nonce verification on the settings form in the func_...
How severe is CVE-2026-4091?
CVE-2026-4091 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-4091?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.