CVE-2026-1300: Mehtevas Responsive Header Plugin

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The Responsive Header plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple plugin settings parameters in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Affected products

• Mehtevas Responsive Header Plugin: up to and including 1.0

Published 2026-01-24. Last modified 2026-06-17.