Release Date: May 30, 2012
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: Version 1.6.6 and below
Vulnerability Type: Cross-site scripting
Problem Description: Failing to properly sanitize user-supplied input the extension is open to Cross-Site Scripting attacks. Exploiting this flaw requires access to the scheduler module.
Solution: An updated version 1.6.7 is available from the TYPO3 extension manager and at http://typo3.org/extensions/repository/view/powermail/1.6.7/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to TYPO3 Security Team member Georg Ringer who discovered the issue.