XSS in Johnbillion Query Monitor
CVE-2026-4267
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 i…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Johnbillion Query Monitor — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/0b75cad9-9f76-4839-8eb2-40d84…
- plugins.trac.wordpress.org/browser/query-monitor/tags/3.20.2/output/html/reques…
- plugins.trac.wordpress.org/browser/query-monitor/tags/3.20.2/output/html/reques…
- plugins.trac.wordpress.org/changeset/3486705/query-monitor
- research.cleantalk.org/cve-2026-4267/
Frequently asked questions
- What is CVE-2026-4267?
- CVE-2026-4267 is a high-severity vulnerability in Johnbillion Query Monitor, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-03-31.
- How severe is CVE-2026-4267?
- High severity. CVSS v3 base score is 7.2 out of 10.