mediawiki is vulnerable to cross-site scripting (XSS). An attacker is able to inject and execute arbitrary Javascript in a user’s browser via the label messages ChangesList special pages such as Special:RecentChanges and Special:Watchlist.
lists.fedoraproject.org/archives/list/[email protected]/message/26UJGHF7LJDOCQN6A3Z4PM7PYRKENJHE/
lists.fedoraproject.org/archives/list/[email protected]/message/2OMSV7B2TCFBOCICN3B4SMQP5HVRJQIT/
phabricator.wikimedia.org/T278058
security-tracker.debian.org/tracker/CVE-2021-30157
security.gentoo.org/glsa/202107-40
www.debian.org/security/2021/dsa-4889