Release Date: June 03, 2013
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: Version 1.6.9 and below, 2.0.1 - 2.0.6
Vulnerability Type: Security Bypass
Problem Description: Failing to invalidate used captcha codes, Powermail allows to use a single captcha code for multiple transmissions. And attacker could bypass further captcha checks by using the same captcha code.
Solution: An updated version 1.6.10 is available from the TYPO3 extension manager and at http://typo3.org/extensions/repository/download/powermail/1.6.10/t3x/. An updated version 2.0.7 is available from the TYPO3 extension manager and at http://typo3.org/extensions/repository/download/powermail/2.0.7/t3x/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Oliver Meyfarth who discovered and reported this issue.
Update Note: For TYPO3 4.5 use version 1.6.10 of powermail, for TYPO3 4.6/4.7 use version 2.0.7.
Follow these steps if you want to update to version 1.6.10: In the extension manager go to "Import Extensions", search for "powermail" and the make a right-click on the extension entry, select "import versions for powermail". Then you will have the possibility to install version 1.6.10