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
VMware directory traversal and privilege escalation vulnerabilities
MySQL CVE-2016-9840 Vulnerability (CVE-2016-9840)
WordPress Plugin WpGenius Job Listing Cross-Site Scripting (1.0.2)
Squid Other Vulnerability (CVE-2016-4556)
WordPress Plugin LearnPress-WordPress LMS Cross-Site Request Forgery (3.2.7.2)