It has been discovered, that TYPO3 CMS is vulnerable to Authentication Bypass.
Component Type: TYPO3 CMS
Release Date: February 28, 2017
Vulnerability Type: Authentication Bypass
Affected Versions: Versions 8.2.0 to 8.6.0
Suggested CVSS v2.0: AV:N/AC:L/Au:S/C:P/I:P/A:N/E:P/RL:O/RC:C
CVE: not assigned yet
Problem Description: Due to late TCA initialization the authentication service fails to restrict frontend user according to the validation rules. Therefore it is possible to authenticate restricted (e.g. disabled) frontend users.
Solution: Update to TYPO3 version 8.6.1 that fixes the problem described.
Credits: Thanks to Thomas Dahlke who discovered and reported the issue.
General Note: All security related code changes are tagged so that you can easily look them up on our review system.