CVE-2026-1300

Name of the Vulnerable Software and Affected Versions Responsive Header plugin for WordPress versions prior to 1.1

Description The software is susceptible to Stored Cross-Site Scripting through multiple plugin settings parameters due to inadequate input sanitization and output escaping. This allows authenticated attackers with administrator-level access or higher to inject arbitrary web scripts into pages. These scripts will execute when a user accesses the injected page. This issue only impacts multi-site installations and those where unfiltered html has been disabled.

Recommendations Update the Responsive Header plugin to version 1.1 or later.