Stored cross-site scripting in MediaWiki - CVE-2025-6595
Published: August 7, 2025
Vulnerability identifier: #VU113750
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2025-6595
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in MultimediaViewer. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
MediaWiki
Debian Linux
mediawiki (Debian package)
Debian Linux
mediawiki (Debian package)
How to mitigate CVE-2025-6595
Install updates from vendor's website.
MediaWiki - addressed in versions 1.39.13, 1.42.7, 1.43.2
mediawiki (Debian package) - update to 1:1.39.13-1~deb12u1
mediawiki (Debian package) - update to 1:1.39.13-1~deb12u1
External References
- https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/TT45WDZ7MDTXXBEFLBMLAJI532O2PN2U/
- https://phabricator.wikimedia.org/T394863
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MultimediaViewer/+/1165106
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MultimediaViewer/+/1165144