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.

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 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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (22.8th 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)

CWE-79 — Cross-site Scripting

References

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.