CVE-2020-35479

Name	CVE-2020-35479
Description	MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example, the return of Language::userTimeAndDate is is always unsafe for HTML in a month value. This affects MediaWiki 1.12.0 and later.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2504-1, DSA-4816-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mediawiki (PTS)	bullseye	1:1.35.13-1+deb11u2	fixed
	bullseye (security)	1:1.35.13-1+deb11u3	fixed
	bookworm	1:1.39.10-1~deb12u1	fixed
	bookworm (security)	1:1.39.12-1~deb12u1	fixed
	trixie, sid	1:1.43.1+dfsg-2	fixed

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

Package	Type	Release	Fixed Version	Origin
mediawiki	source	stretch	1:1.27.7-1~deb9u7	DLA-2504-1
mediawiki	source	buster	1:1.31.12-1~deb10u1	DSA-4816-1
mediawiki	source	(unstable)	1:1.35.1-1

https://phabricator.wikimedia.org/T268938
https://lists.wikimedia.org/pipermail/wikitech-l/2020-December/094126.html