CVE-2021-30156: Fedoraproject Fedora

Medium severity, CVSS 4.3. EPSS: 1.1% 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. Special:Contributions can leak that a "hidden" user exists.

Affected products

• 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 2021-04-09. Last modified 2026-06-17.