Release Date: May 24, 2016
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 6.2.7 and below
Vulnerability Type: Missing Access Check
Problem Description: Failing to properly sanitize user input, the extension might be vulnerable to information disclosure or remote code execution.
Solution: Updated versions 1.4.3, 6.0.4 and 6.2.8 are available from the TYPO3 Extension Manager and at https://typo3.org/extensions/repository/download/sf_register/1.4.3/t3x/, https://typo3.org/extensions/repository/download/sf_register/6.0.4/t3x/ and http://typo3.org/extensions/repository/download/sf_register/6.2.8/t3x/. Users of the extension are advised to update the extension as soon as possible.
Note: Further information can be found in the TYPO3-CORE-SA-2016-013 advisory.
Credits: Credits go to Oliver Hader who discovered and reported the vulnerability.