Parameters injection in the SyntaxHighlight extension of Mediawiki before 1.23.16, 1.27.3 and 1.28.2 might result in multiple vulnerabilities.
https://security-tracker.debian.org/tracker/CVE-2017-0372
https://phabricator.wikimedia.org/T158689
https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-April/000209.html
https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-April/000207.html