Description
The (1) Special:Preferences and (2) Special:UserLogin pages in MediaWiki before 1.19.20, 1.22.x before 1.22.12 and 1.23.x before 1.23.5 allows remote authenticated users to conduct cross-site scripting (XSS) attacks or have unspecified other impact via crafted CSS, as demonstrated by modifying MediaWiki:Common.css.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mediawiki | 1:1.19.20+dfsg-1 | — |
| Debian 13 | mediawiki | 1:1.19.20+dfsg-1 | — |
| Debian 12 | mediawiki | 1:1.19.20+dfsg-1 | — |
| Debian 7 | mediawiki | 1:1.19.20+dfsg-0+deb7u1 | DSA-3046-1 |
Advisories 1
- DSA-3046-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://bugzilla.wikimedia.org/show_bug.cgi?id=70672
- [MediaWiki-announce] 20141002 MediaWiki Security and Maintenance Releases: 1.19.20, 1.22.12 and 1.23.5 mailing-list
- DSA-3046 vendor-advisory
- 61752 third-party-advisory
- [oss-security] 20141002 Re: CVE request: Mediawiki before 1.19.20, 1.22.12, 1.23.5 XSS through CSS mailing-list
- 70238 vdb-entry