Mediawiki before 1.28.1 / 1.27.2 / 1.23.16 contains a flaw making rawHTML mode apply to system messages.Referenceshttps://lists.wikimedia.org/pipermail/mediawiki-announce/2017-April/000207.htmlhttps://phabricator.wikimedia.org/T156184https://security-tracker.debian.org/tracker/CVE-2017-0368