Description
The CentralNotice extension for MediaWiki before 1.19.9, 1.20.x before 1.20.8, and 1.21.x before 1.21.3 sets the Cache-Control header to cache session cookies when a user is autocreated, which allows remote attackers to authenticate as the created user.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Wikimedia Foundation | MediaWiki | before 1.19.9, 1.20.x before 1.20.8, 1.21.x before 1.21.3 | — |
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 | 1:1.19.8+dfsg-2.2 | — |
| Debian 13 | mediawiki | 1:1.19.8+dfsg-2.2 | — |
| Debian 12 | mediawiki | 1:1.19.8+dfsg-2.2 | — |
| 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
- https://bugzilla.wikimedia.org/show_bug.cgi?id=53032
- http://lists.fedoraproject.org/pipermail/package-announce/2013-December/123011.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-December/122998.html
- http://lists.wikimedia.org/pipermail/mediawiki-announce/2013-November/000135.html