Cross-site request forgery (CSRF) vulnerability in the Special:ExpandedTemplates page in MediaWiki before 1.19.22 1.20.x through 1.22.x before 1.22.14 and 1.23.x before 1.23.7 when $wgRawHTML is set to true allows remote attackers to hijack the authentication of users with edit permissions for requests that cross-site scripting (XSS) attacks via the wpInput parameter which is not properly handled in the preview.