CVE-2021-30155: Debian Linux

Medium severity, CVSS 4.3. EPSS: 1.2% 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. ContentModelChange does not check if a user has correct permissions to create and set the content model of a nonexistent page.

Affected products

• Debian Debian Linux: version 9.0 only; 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 2021-04-09. Last modified 2026-06-17.