CVE-2026-3995 OPEN-BRAIN <= 0.5.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'API Key' Setting
Administrators can inject arbitrary scripts via the API Key setting, leading to stored XSS execution on the settings page.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3995?
CVE-2026-3995 is a medium-severity cross-site scripting vulnerability in faridsaniee OPEN-BRAIN, published on 16 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-3995?
How do I fix CVE-2026-3995?
No fix has been published for CVE-2026-3995 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-3995 being exploited?
There is no known exploitation of CVE-2026-3995 in the wild and no public exploit code.
Sources
Also known as GHSA-pq6h-83gw-pj9p.