CVE-2026-4091: OPEN-BRAIN <= 0.5.0 - Cross-Site Request Forgery

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-15 · updated 2026-06-17
Weakness: CWE-352

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.

Affected products

faridsaniee OPEN-BRAIN: through 0.5.0

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-bb39-ff1a01d739cf?source=cve

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