Multiple cross-site scripting (XSS) vulnerabilities in the SemanticForms extension for MediaWiki allow remote attackers to inject arbitrary web script or HTML via the (1) wpSummary parameter to Special:FormEdit, the (2) "Template label (optional)" field in a form, or a (3) Field name in a template.
https://security.gentoo.org/glsa/201510-05
https://phabricator.wikimedia.org/T103765
https://phabricator.wikimedia.org/T103761
https://phabricator.wikimedia.org/T103391
https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-August/000179.html
http://www.securityfocus.com/bid/76334
http://www.openwall.com/lists/oss-security/2015/08/27/6
http://www.openwall.com/lists/oss-security/2015/08/12/6
http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165193.html