An issue was discovered in the Cargo extension in MediaWiki before 1.35.14, 1.36.x through 1.39.x before 1.39.6, and 1.40.x before 1.40.2. The Special:Drilldown page allows XSS via artist, album, and position parameters because of applied filter values in drilldown/CargoAppliedFilter.php.
https://phabricator.wikimedia.org/T348687
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/965214