Cross-site scripting (XSS) vulnerability in the Hovercards extension for MediaWiki allows remote attackers to inject arbitrary web script or HTML via vectors related to text extracts.
https://phabricator.wikimedia.org/T69180
https://lists.wikimedia.org/pipermail/mediawiki-announce/2014-December/000173.html
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-9299