CVE-2020-35478
MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. MediaWiki:blanknamespace potentially can be output as raw HTML with SCRIPT tags via LogFormatter::makePageLink(). This affects MediaWiki 1.33.0 and later.
Date published : 2020-12-18
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html