Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - FlaggedRevs Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - FlaggedRevs Extension: from 1.43.X before 1.43.2.
https://phabricator.wikimedia.org/T394397
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/FlaggedRevs/+/1165929