Description
MediaWiki through 1.33.1 allows attackers to bypass the Title_blacklist protection mechanism by starting with an arbitrary title, establishing a non-resolvable redirect for the associated page, and using redirect=1 in the action API when editing that page.
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 | 1:1.31.6-1 | — |
| Debian 13 | mediawiki | 1:1.31.6-1 | — |
| Debian 12 | mediawiki | 1:1.31.6-1 | — |
| Debian 10 | mediawiki | 1:1.31.6-1~deb10u1 | DSA-4592-1 |
| Debian 9 | mediawiki | 1:1.27.7-1~deb9u3 | DSA-4592-1 |
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 | >= 1.31.0, < 1.31.6 | 1.31.6 | GHSA-pjv5-vv93-p648 |
| Packagist | mediawiki/core | >= 1.32.0, < 1.32.6 | 1.32.6 | GHSA-pjv5-vv93-p648 |
| Packagist | mediawiki/core | >= 1.33.0, < 1.33.2 | 1.33.2 | GHSA-pjv5-vv93-p648 |
| Packagist | mediawiki/core | >= 1.33.99, < 1.34.0 | 1.34.0 | GHSA-pjv5-vv93-p648 |
Advisories 1
- DSA-4592-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026