Description
MediaWiki before 1.19.6 and 1.20.x before 1.20.5 allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated by a CDATA section containing valid UTF-7 encoded sequences in a SVG file, which is then incorrectly interpreted as UTF-8 by Chrome and Firefox.
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 | 1:1.19.6-1 | — |
| Debian 13 | mediawiki | 1:1.19.6-1 | — |
| Debian 12 | mediawiki | 1:1.19.6-1 | — |
| Debian 7 | mediawiki | 1:1.19.14+dfsg-0+deb7u1 | DSA-2891-1 |
| Debian 7 | mediawiki-extensions | 3.5~deb7u1 | DSA-2891-1 |
Advisories 1
- DSA-2891-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- FEDORA-2013-7714 vendor-advisory
- 57472 third-party-advisory
- https://bugzilla.wikimedia.org/show_bug.cgi?id=47304
- 55433 third-party-advisory
- DSA-2891 vendor-advisory
- FEDORA-2013-7654 vendor-advisory
- FEDORA-2013-7701 vendor-advisory
- 59594 vdb-entry
- GLSA-201310-21 vendor-advisory
- [MediaWiki-announce] 20130430 MediaWiki Security Release: 1.20.5 and 1.19.6 mailing-list
- [oss-security] 20130501 Re: Mediawiki CVE request ( was Fw: [MediaWiki-announce] MediaWiki Security Release: 1.20.5 and 1.19.6) mailing-list