An issue was discovered in MediaWiki before 1.35.11, 1.36.x through 1.38.x before 1.38.7, and 1.39.x before 1.39.4. BlockLogFormatter.php in BlockLogFormatter allows XSS in the partial blocks feature.
lists.fedoraproject.org/archives/list/[email protected]/message/2UIVGYECQGTUC2LLPVCZBPDLCTOHL2F6/
lists.fedoraproject.org/archives/list/[email protected]/message/6CHRX6DSLAMVXCV2YMJEWOLTBEYSESE5/
lists.fedoraproject.org/archives/list/[email protected]/message/DOAXEGYBOEM4JWB4J3BDH73NK2LCYC3O/
phabricator.wikimedia.org/T332889
www.debian.org/security/2023/dsa-5447
www.mediawiki.org/wiki/Release_notes/1.40