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CVE-2026-3995

4.4 · MEDIUM

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.

Published Apr 16, 2026CWE-79EPSS 0.39%

Overview

CVE-2026-3995 is a medium-severity vulnerability. It was published on April 16, 2026 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refplugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L128Refplugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L252Refplugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L253Refplugins.trac.wordpress.org/browser/open-brain/tags/0.5.0/index.php#L272Refplugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L128Refplugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L252Refplugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L253Refplugins.trac.wordpress.org/browser/open-brain/trunk/index.php#L272Refwww.wordfence.com/threat-intel/vulnerabilities/id/3fe3fa95-cc1d-469b-8a97-37987b9ae362?source=cve

How CyberStrike helps

Frequently asked questions

What is CVE-2026-3995?

CVE-2026-3995 is a medium-severity vulnerability. It was published on April 16, 2026 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

How severe is CVE-2026-3995?

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-3995?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-3995?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-3995 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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