Description
An Incorrect Access Control vulnerability was found in Wikimedia MediaWiki 1.18.0 through 1.32.1. It is possible to bypass the limits on IP range blocks ($wgBlockCIDRLimit) by using the API. Fixed in 1.32.2, 1.31.2, 1.30.2 and 1.27.6.
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 | 1:1.31.2-1 | — |
| Debian 13 | mediawiki | 1:1.31.2-1 | — |
| Debian 12 | mediawiki | 1:1.31.2-1 | — |
| Debian 9 | mediawiki | 1:1.27.7-1~deb9u1 | DSA-4460-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | mediawiki | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | mediawiki/core | >= 1.18.0, < 1.27.6 | 1.27.6 | GHSA-7mqg-5fgh-xh4r |
| Packagist | mediawiki/core | >= 1.30.0, < 1.30.2 | 1.30.2 | GHSA-7mqg-5fgh-xh4r |
| Packagist | mediawiki/core | >= 1.31.0, < 1.31.2 | 1.31.2 | GHSA-7mqg-5fgh-xh4r |
| Packagist | mediawiki/core | >= 1.32.0, < 1.32.2 | 1.32.2 | GHSA-7mqg-5fgh-xh4r |
Advisories 1
- DSA-4460-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026