It has been discovered, that editors with access to the file list module could list all files names and folder names in the root directory of a TYPO3 installation. Modification of files, listing further nested directories or retrieving file contents was not possible. A valid backend user account is needed to exploit this vulnerability.
github.com/advisories/GHSA-r287-hc8j-w56h
github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/2015-07-01-4.yaml
github.com/TYPO3/typo3/commit/d9caccb26c954834e7d43fbbe84a3130cc95524a
typo3.org/security/advisory/typo3-core-sa-2015-005
typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2015-005