TYPO3 8.3.0 through 8.7.26 and 9.0.0 through 9.5.7 allows XSS.
github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2019-12748.yaml
github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2019-12748.yaml
github.com/TYPO3-CMS/core
nvd.nist.gov/vuln/detail/CVE-2019-12748
typo3.org/cms/release-news/typo3-8-release-notes
typo3.org/security/advisory/typo3-core-sa-2019-015