Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - WikiHiero Extension allows Stored XSS.This issue affects Mediawiki - WikiHiero Extension: from 1.43.X before 1.43.2.
https://phabricator.wikimedia.org/T396524
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/wikihiero/+/1166018