TYPO3 is an enterprise content management system. Starting in version 13.0.0 and prior to version 13.1.1, the history backend module is vulnerable to HTML injection. Although Content-Security-Policy headers effectively prevent JavaScript execution, adversaries can still inject malicious HTML markup. Exploiting this vulnerability requires a valid backend user account. TYPO3 version 13.1.1 fixes the problem described.
https://typo3.org/security/advisory/typo3-core-sa-2024-007
https://github.com/TYPO3/typo3/security/advisories/GHSA-xjwx-78x7-q6jc
https://github.com/TYPO3/typo3/commit/56afa304ba8b5ad302e15df5def71bcc8d820375