CVE-2021-30159: Debian Linux

Medium severity, CVSS 4.3. EPSS: 1.5% 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. Users can bypass intended restrictions on deleting pages in certain "fast double move" situations. MovePage::isValidMoveTarget() uses FOR UPDATE, but it's only called if Title::getArticleID() returns non-zero with no special flags. Next, MovePage::moveToInternal() will delete the page if getArticleID(READ_LATEST) is non-zero. Therefore, if the page is missing in the replica DB, isValidMove() will return true, and then moveToInternal() will unconditionally delete the page if it can be found in the master.

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.