---
id: CVE-2026-4267
title: >-
  The Query Monitor – The developer tools panel for WordPress plugin for
  WordPress is vulnerable to Reflected Cross-Site Scripting via the
  ‘$_SERVER['REQUEST_URI']’ parameter in all versions up to, and including,
  3.20.3 due to insufficient…
summary: >-
  The Query Monitor – The developer tools panel for WordPress plugin for
  WordPress is vulnerable to Reflected Cross-Site Scripting via the
  ‘$_SERVER['REQUEST_URI']’ parameter in all versions up to, and including,
  3.20.3 due to insufficient…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4267'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/query-monitor/tags/3.20.2/output/html/request.php#L60
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/query-monitor/tags/3.20.2/output/html/request.php#L70
    label: security@wordfence.com
  - url: 'https://plugins.trac.wordpress.org/changeset/3486705/query-monitor'
    label: security@wordfence.com
  - url: 'https://research.cleantalk.org/cve-2026-4267/'
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/0b75cad9-9f76-4839-8eb2-40d84662846d?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00302
epssPercentile: 0.23156
ingestedAt: '2026-07-24T20:38:02.051Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.