What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
The Responsive Header Plugin for WordPress contains a cross-site scripting (XSS) vulnerability in versions up to 1.0. An authenticated administrator with high privileges can inject malicious scripts that affect other users across the site. The vulnerability requires specific conditions to exploit but can compromise site integrity and user data.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect site functionality.
Potential impact on your site
04Site Impact
Administrators can be tricked into injecting malicious code that affects all site visitors and other admin accounts.
Conditions required to exploit
05Prerequisites
Attacker must have high-level administrator privileges; no user interaction required from victims.
Key dates
06Disclosure timeline
January 24, 2026
CVE published
April 8, 2026
Record updated
