CVE-2020-25812

Name	CVE-2020-25812
Description	An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DSA-4767-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mediawiki (PTS)	buster	1:1.31.16-1+deb10u2	fixed
	buster (security)	1:1.31.16-1+deb10u4	fixed
	bullseye (security), bullseye	1:1.35.8-1~deb11u1	fixed
	bookworm, sid	1:1.39.2-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
mediawiki	source	stretch	(not affected)
mediawiki	source	buster	1:1.31.10-1~deb10u1	DSA-4767-1
mediawiki	source	(unstable)	1:1.35.0-1

Notes

[stretch] - mediawiki <not-affected> (Vulnerable code introduced later)
https://lists.wikimedia.org/pipermail/wikitech-l/2020-September/093888.html
https://phabricator.wikimedia.org/T255918