What the vulnerability does
01Description
The HTTP Headers plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 1.19.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions 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 HTTP Headers component in zinoui versions up to 1.19.2 contains a cross-site scripting (XSS) vulnerability in how it processes and outputs HTTP header values. An attacker with high privileges can inject malicious scripts that execute in other users' browsers when the affected header is rendered. The vulnerability requires specific conditions to exploit and has limited scope, but can compromise user sessions or steal sensitive data.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts into HTTP headers that execute in other users' browsers.
Potential impact on your site
04Site Impact
Authenticated administrators or high-privilege users could inject scripts affecting other site users' sessions and data.
Conditions required to exploit
05Prerequisites
Attacker must have high-level privileges on the site; no user interaction required.
Key dates
06Disclosure timeline
April 22, 2026
CVE published
April 22, 2026
Record updated
