CVE-2026-13707: Mediawiki

High severity, CVSS 7.6. EPSS: 0.3% chance of exploitation in the next 30 days.

Session fixation vulnerability in Wikimedia Foundation OAuth. This vulnerability is associated with program files src/Backend/MWOAuthServer.Php. This issue affects OAuth: from * through 1.46.0, 1.45.4, 1.44.6, 1.43.9.

Affected products

• Mediawiki Mediawiki: from 1.43.0, before 1.43.9 (fixed in 1.43.9); from 1.44.0, before 1.44.6 (fixed in 1.44.6); from 1.45.0, before 1.45.4 (fixed in 1.45.4); version 1.46.0 only

Published 2026-07-01. Last modified 2026-07-13.