Description
Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files includes/Mail/UserMailer.Php.
This issue affects CheckUser: from * before 1.39.14, 1.43.4, 1.44.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Wikimedia Foundation | CheckUser | < 1.39.14, 1.43.4, 1.44.1 | 1.39.14, 1.43.4, 1.44.1 |
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 | 1:1.43.6+dfsg-1 | — |
| Debian 13 | mediawiki | 1:1.43.6+dfsg-1~deb13u1 | DSA-6085-1 |
| Debian 12 | mediawiki | 1:1.39.17-1~deb12u1 | DSA-6085-1 |
| Debian 11 | mediawiki | 1:1.35.13-1+deb11u6 | DLA-4428-1 |
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 3
- WID-SEC-2025-2825 MediaWiki: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Feb 3, 2026
- DLA-4428-1 mediawiki - security update Debian Security (DSA / DLA) · Dec 30, 2025
- DSA-6085-1 mediawiki - security update Debian Security (DSA / DLA) · Dec 19, 2025