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().
Remediation
References
Related Vulnerabilities
WebLogic Deserialization of Untrusted Data Vulnerability (CVE-2018-3245)
MySQL CVE-2013-1566 Vulnerability (CVE-2013-1566)
WordPress Plugin Attach Gallery Posts Cross-Site Scripting (1.6)
Python Out-of-bounds Write Vulnerability (CVE-2018-25032)
Oracle Database Server CVE-2017-10282 Vulnerability (CVE-2017-10282)