What the vulnerability does
01Description
The Query Monitor – The developer tools panel for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘$_SERVER['REQUEST_URI']’ parameter in all versions up to, and including, 3.20.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Explanation of Vulnerability in Simple Terms
02Summary
Query Monitor versions up to 3.20.3 contain a cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts. The vulnerability affects the scope beyond the vulnerable component itself. An attacker can craft a malicious request to inject JavaScript that executes in users' browsers, potentially stealing session data or performing actions on their behalf.
What an attacker can do
03Attacker Capabilities
Inject and execute malicious JavaScript in users' browsers without authentication.
Potential impact on your site
04Site Impact
Visitors to your site could have their sessions hijacked or be redirected to malicious pages.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
March 31, 2026
CVE published
April 8, 2026
Record updated
