Component Type: TYPO3 CMS
Release Date: April 12, 2016
Vulnerable subcomponent: Authentication
Vulnerability Type: Authentication Bypass
Affected Versions: Versions 6.2.0 to 6.2.19, 7.6.0 to 7.6.4 and 8.0.0
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: The default authentication service misses to invalidate empty strings as password. Therefore it is possible to authenticate backend and frontend users without password set in the database.
Solution: Update to TYPO3 versions 6.2.20, 7.6.5 or 8.0.1 that fix the problem described.
Note: TYPO3 does not allow to create user accounts without a password. Your TYPO3 installation might only be affected if there is a third party component creating user accounts without password by directly manipulating the database.
Credits: Thanks to Kevin Ditscheid 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.