Description
An XSS issue was discovered in MediaWiki before 1.35.6, 1.36.x before 1.36.4, and 1.37.x before 1.37.2. The widthheight, widthheightpage, and nbytes properties of messages are not escaped when used in galleries or Special:RevisionDelete.
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 | 1:1.35.6-1 | — |
| Debian 13 | mediawiki | 1:1.35.6-1 | — |
| Debian 12 | mediawiki | 1:1.35.6-1 | — |
| Debian 11 | mediawiki | 1:1.35.8-1~deb11u1 | DSA-5246-1 |
| Debian 10 | mediawiki | 1:1.31.16-1+deb10u3 | DLA-3117-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mediawiki | No fix yet | — |
| Ubuntu 26.04 LTS | mediawiki | No fix yet | — |
| Ubuntu 25.10 | mediawiki | No fix yet | — |
| Ubuntu 18.04 LTS | mediawiki | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | mediawiki | No fix yet | — |
| Ubuntu Pro 22.04 LTS | mediawiki | No fix yet | — |
| Ubuntu Pro 20.04 LTS | mediawiki | No fix yet | — |
Advisories 2
- DSA-5246-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3117-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://phabricator.wikimedia.org/T297543
- FEDORA-2022-69bc42d6cf vendor-advisory
- [debian-lts-announce] 20220922 [SECURITY] [DLA 3117-1] mediawiki security update mailing-list
- DSA-5246 vendor-advisory
- GLSA-202305-24 vendor-advisory