CVE-2024-23172: Mediawiki

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

An issue was discovered in the CheckUser extension in MediaWiki before 1.35.14, 1.36.x through 1.39.x before 1.39.6, and 1.40.x before 1.40.2. XSS can occur via message definitions. e.g., in SpecialCheckUserLog.

Affected products

• Mediawiki Mediawiki: before 1.35.14 (fixed in 1.35.14); from 1.36.0, before 1.39.6 (fixed in 1.39.6); from 1.40.0, before 1.40.2 (fixed in 1.40.2)

Published 2024-01-12. Last modified 2026-06-17.