Description
An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3. An auto-block can occur for an untrusted X-Forwarded-For header.
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 | 1:1.39.4-1 | — |
| Debian 13 | mediawiki | 1:1.39.4-1 | — |
| Debian 12 | mediawiki | 1:1.39.4-1~deb12u1 | DSA-5447-1 |
| Debian 11 | mediawiki | 1:1.35.11-1~deb11u1 | DSA-5447-1 |
| Debian 10 | mediawiki | 1:1.31.16-1+deb10u6 | DLA-3540-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mediawiki | No fix yet | — |
| Ubuntu 25.10 | mediawiki | No fix yet | — |
| Ubuntu 18.04 LTS | mediawiki | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | >= 1.39.0, < 1.39.3 | 1.39.3 | GHSA-5vj8-g3qg-4qh6 |
| Packagist | mediawiki/core | >= 1.38.0, < 1.38.6 | 1.38.6 | GHSA-5vj8-g3qg-4qh6 |
| Packagist | mediawiki/core | < 1.35.10 | 1.35.10 | GHSA-5vj8-g3qg-4qh6 |
Advisories 2
- DSA-5447-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3540-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://phabricator.wikimedia.org/T285159
- https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/REL1_39/RELEASE-NOTES-1.39
- FEDORA-2023-567baef490 vendor-advisory
- FEDORA-2023-9d6ab5ebf2 vendor-advisory
- DSA-5447 vendor-advisory
- [debian-lts-announce] 20230822 [SECURITY] [DLA 3540-1] mediawiki security update mailing-list