CVE-2026-3995: OPEN-BRAIN (WordPress plugin) · Cross-site Scripting
Affects OPEN-BRAIN (WordPress plugin)Source CVE Database V5
Not known to be exploited · CVSS 4.4 Medium.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 16 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| faridsanieeOPEN-BRAIN | Affected
| Fixed in– |
AI-suggested
Until an official fix is available, restrict administrator access to trusted users only. Avoid entering untrusted data into the 'API Key' settings field. Monitor for updates from the plugin vendor or WordPress security channels for a patch or official mitigation.
Description
The OPEN-BRAIN plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'API Key' settings field in all versions up to, and including, 0.5.0. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_text_field() which strips HTML tags but does not encode double quotes or other HTML-special characters needed for safe attribute context output. The API key value is saved via update_option() and later output into an HTML input element's value attribute without esc_attr() escaping. This makes it possible for authenticated attackers, with Administrator-level access, to inject arbitrary web scripts via attribute breakout payloads (e.g., double quotes followed by event handlers) that execute whenever a user accesses the plugin settings page.
References
- wordfence.com/threat-intel/vulnerabilities/id/3fe3fa95-cc1d-469b-8a97-37987b9ae362?source=cve (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/trunk/index.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/trunk/index.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/trunk/index.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/trunk/index.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php (opens in a new tab)