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
Handlebars Improper Control of Generation of Code ('Code Injection') Vulnerability (CVE-2019-20920)
WebLogic CVE-2022-21257 Vulnerability (CVE-2022-21257)
Ruby on Rails Improper Authentication Vulnerability (CVE-2012-3424)
WordPress Plugin Product Catalog SQL Injection (4.2.2)
MediaWiki Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2015-8005)