An issue was discovered in TYPO3 before 8.7.30, 9.x before 9.5.12, and 10.x before 10.2.2. It has been discovered that the extraction of manually uploaded ZIP archives in Extension Manager is vulnerable to directory traversal. Admin privileges are required in order to exploit this vulnerability. (In v9 LTS and later, System Maintainer privileges are also required.)
https://typo3.org/security/advisory/typo3-core-sa-2019-024/
https://review.typo3.org/q/%2522Resolves:+%252388764%2522+topic:security