Description
An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=mcrundo followed by action=mcrrestore to replace the content of any arbitrary page (that the user doesn't have edit rights for). This applies to any public wiki, or a private wiki that has at least one page set in $wgWhitelistRead.
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 | 1:1.35.5-1 | — |
| Debian 13 | mediawiki | 1:1.35.5-1 | — |
| Debian 12 | mediawiki | 1:1.35.5-1 | — |
| Debian 11 | mediawiki | 1:1.35.4-1+deb11u2 | DSA-5021-1 |
Advisories 2
- DSA-5021-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2023-1259 MediaWiki: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 21, 2023