CVE-2026-3995
OPEN-BRAIN <= 0.5.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'API Key' Setting
- State
- Published
- Severity
- 4.4 Medium
- Published
- Apr 16, 2026
- Updated
- Apr 16, 2026
- Reserved
- Mar 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.4 Medium | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N | Wordfence |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
OPEN-BRAINfaridsaniee |
|
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/3fe3fa95-cc1d-469b-8a97-37987b9ae362?source=cve
- https://plugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L272
- 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#L252
- https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L252
- https://plugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L253
- https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L253
- https://plugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L128
- https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L128
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