CVEvulnerability

CVE-2021-30159

4.3 MEDIUM Published 2021-04-09 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-04-09
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0 ([email protected])
4.0 MEDIUM — AV:N/AC:L/Au:S/C:N/I:P/A:N

Description

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 configurations

• mediawiki mediawiki (< 1.31.12) • mediawiki mediawiki (>= 1.32.0 < 1.35.2) • debian debian linux 9.0 • debian debian linux 10.0 • fedoraproject fedora 33 • fedoraproject fedora 34

References