CVE-2015-8624: Mediawiki

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

The User::matchEditToken function in includes/User.php in MediaWiki before 1.23.12, 1.24.x before 1.24.5, 1.25.x before 1.25.4, and 1.26.x before 1.26.1 does not perform token comparison in constant time before determining if a debugging message should be logged, which allows remote attackers to guess the edit token and bypass CSRF protection via a timing attack, a different vulnerability than CVE-2015-8623.

Affected products

• Mediawiki Mediawiki: up to and including 1.23.11; version 1.24.0 only; version 1.24.1 only; version 1.24.2 only; version 1.24.3 only; version 1.24.4 only; …

Published 2017-03-23. Last modified 2026-06-17.