Improper authentication in MediaWiki - CVE-2025-6926
Published: August 7, 2025
Vulnerability identifier: #VU113755
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-6926
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: MediaWiki.org
Affected software:
MediaWiki
MediaWiki
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in the authentication logic when using SUL3 autologin for re-authentication. A remote attacker can bypass authentication process and gain unauthorized access to the application.
How to mitigate CVE-2025-6926
Install updates from vendor's website.
Sources
- https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/TT45WDZ7MDTXXBEFLBMLAJI532O2PN2U/
- https://phabricator.wikimedia.org/T389010
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CentralAuth/+/1165164
- https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1165117
- https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1165090