CVE-2021-30157: Debian Linux

Medium severity, CVSS 6.1. EPSS: 1.4% chance of exploitation in the next 30 days.

An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. On ChangesList special pages such as Special:RecentChanges and Special:Watchlist, some of the rcfilters-filter-* label messages are output in HTML unescaped, leading to XSS.

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 33 only; version 34 only
• Mediawiki Mediawiki: before 1.31.12 (fixed in 1.31.12); from 1.32.0, before 1.35.2 (fixed in 1.35.2)

Published 2021-04-06. Last modified 2026-06-17.