CVE-2026-4267
High
Description
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.
SeverityHigh
CVSS7.2
Exploit probability—
ProductJohnbillion/query-monitor
PublishedMar 31, 2026
First seenMar 31, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- johnbillion/query-monitor3.20.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| johnbillion/query-monitorPackagist | v < 3.20.4 | 3.20.4 |
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