Description
In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.
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 | 1:1.31.4-1 | — |
| Debian 13 | mediawiki | 1:1.31.4-1 | — |
| Debian 12 | mediawiki | 1:1.31.4-1 | — |
| Debian 10 | mediawiki | 1:1.31.4-1~deb10u1 | DSA-4545-1 |
| Debian 9 | mediawiki | 1:1.27.7-1~deb9u2 | DSA-4545-1 |
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 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | mediawiki/core | >= 1.31.0, < 1.31.4 | 1.31.4 | GHSA-7hwr-f745-5rwq |
| Packagist | mediawiki/core | >= 1.32.0, < 1.32.4 | 1.32.4 | GHSA-7hwr-f745-5rwq |
| Packagist | mediawiki/core | >= 1.33.0, < 1.33.1 | 1.33.1 | GHSA-7hwr-f745-5rwq |
Advisories 1
- DSA-4545-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://phabricator.wikimedia.org/T230402
- FEDORA-2019-c4cdd73c74 vendor-advisory
- DSA-4545 vendor-advisory
- 20191021 [SECURITY] [DSA 4545-1] mediawiki security update mailing-list
- FEDORA-2019-3ba38e1cdb vendor-advisory