Description
TYPO3 is an open source PHP based web content management system released under the GNU GPL. It has been discovered that the `f:asset.css` view helper is vulnerable to cross-site scripting when user input is passed as variables to the CSS. Update to TYPO3 version 10.4.32 or 11.5.16 that fix the problem. There are no known workarounds for this issue.
Remediation
References
Related Vulnerabilities
WordPress Plugin Strong Testimonials Cross-Site Scripting (2.40.0)
Craft CMS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2019-14280)
TYPO3 Improper Authentication Vulnerability (CVE-2014-3944)
Plone CMS Use of Externally-Controlled Format String Vulnerability (CVE-2017-5524)