Description
The sanitizeLocalUrl function in TYPO3 6.x before 6.2.15, 7.x before 7.4.0, 4.5.40, and earlier allows remote authenticated users to bypass the XSS filter and conduct cross-site scripting (XSS) attacks via a base64 encoded data URI, as demonstrated by the (1) returnUrl parameter to show_rechis.php and the (2) redirect_url parameter to index.php.
Remediation
References
Related Vulnerabilities
WordPress Plugin GigPress Cross-Site Scripting (2.3.27)
WordPress Plugin Eu Cookie Notice Cross-Site Request Forgery (1.0.6)
Joomla! Core 1.5.x Arbitrary File Upload (1.5.0 - 1.5.15)
Check for apache versions up to 1.3.25, 2.0.38
Atlassian Jira Authorization Bypass Through User-Controlled Key Vulnerability (CVE-2020-36231)