It has been discovered that mechanisms used for configuration of RequireJS package loading are susceptible to information disclosure. This way a potential attack can retrieve additional information about installed system and third party extensions.
github.com/advisories/GHSA-p2h4-7fp3-cmh8
github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/2019-01-22-1.yaml
github.com/TYPO3-CMS/core/commit/7960334bba1223a681283158f67a999334e88cf1
github.com/TYPO3-CMS/core/commit/9453d8a8763fffa76deb6a16f6b99c0ab6f3d8f1
typo3.org/security/advisory/typo3-core-sa-2019-001