ShortDescription is a MediaWiki extension that provides local short description support. A cross-site scripting (XSS) vulnerability exists in versions prior to 2.3.4. On a wiki that has the ShortDescription enabled XSS can be triggered on any page or the page with the action=info parameter which displays the shortdesc property. This is achieved using the wikitext `{{SHORTDESC:&lt;img src=x onerror=alert()&gt;}}`. This issue has a patch in version 2.3.4.