CVE-2022-34911 Information

Description

An issue was discovered in MediaWiki before 1.35.7 1.36.x and 1.37.x before 1.37.3 and 1.38.x before 1.38.1. XSS can occur in configurations that allow a JavaScript payload in a username. After account creation when it sets the page title to \Welcome\ followed by the username the username is not escaped: SpecialCreateAccount::successfulAction() calls ::showSuccessPage() with a message as second parameter and OutputPage::setPageTitle() uses text().

Reference

https://phabricator.wikimedia.org/T308471