Failing to properly encode user input, templates using built-in Fluid ViewHelpers are vulnerable to cross-site scripting.
github.com/advisories/GHSA-85ch-44w7-rf32
github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/2019-01-22-4.yaml
github.com/TYPO3/typo3/commit/732c4acfaeaa7fd193674cd4d1ca7e369e21b96f
github.com/TYPO3/typo3/commit/c94f566514eaff62dd836541c99b438ac55f6842
typo3.org/security/advisory/typo3-core-sa-2019-005