CVE-2026-3995

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.

• CWE-79

• https://plugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L128
• 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#L128
• 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/3fe3fa95-cc1d-469b-8a97-37987b9ae362?source=cve

Published

Apr 16, 2026

Last Modified

Jun 17, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-39940ChurchCRM is an open-source church management system. Prior …5.3
• CVE-2026-39941ChurchCRM is an open-source church management system. Prior …6.1
• CVE-2026-39942Directus is a real-time API and App dashboard for managing S…8.8
• CVE-2026-39943Directus is a real-time API and App dashboard for managing S…6.5
• CVE-2026-39946OpenBao is an open source identity-based secrets management …4.9
• CVE-2026-39948Cacti is an open source performance and fault management fra…9.8
• CVE-2026-39951Cacti is an open source performance and fault management fra…8.8
• CVE-2026-39955Cacti is an open source performance and fault management fra…9.8
• CVE-2026-39956jq is a command-line JSON processor. In commits after 69785b…6.1
• CVE-2026-39957Lychee is a free, open-source photo-management tool. Prior t…4.3
• CVE-2026-39958oma is a package manager for AOSC OS. Prior to 1.25.2, oma-t…9.1
• CVE-2026-39959Tmds.DBus provides .NET libraries for working with D-Bus fro…7.1