WikiDiscover is an extension designed for use with a CreateWiki managed farm to display wikis. Special:WikiDiscover is a special page that lists all wikis on the wiki farm. However, the special page does not make any effort to escape the wiki name or description. Therefore, if a wiki sets its name and/or description to an XSS payload, the XSS will execute whenever the wiki is shown on Special:WikiDiscover. This issue has been patched with commit 2ce846dd93 and all users are advised to apply that patch. User unable to upgrade should block access to Special:WikiDiscover.

WikiDiscover is an extension designed for use with a CreateWiki managed farm to display wikis. On Special:WikiDiscover, the Language::date function is used when making the human-readable timestamp for inclusion on the wikicreation column. This function uses interface messages to translate the names of months and days. It uses the ->text() output mode, returning unescaped interface messages. Since the output is not escaped later, the unescaped interface message is included on the output, resulting in an XSS vulnerability. Exploiting this on-wiki requires the (editinterface) right. This vulnerability has been addressed in commit 267e763a0. Users are advised to update their installations. There are no known workarounds for this vulnerability.