CVE-2021-44857

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.

Bugs

• <https://bugs.launchpad.net/ubuntu/+source/mediawiki/+bug/1955352&gt;