It has been discovered that the extension "powermail" (powermail) is vulnerable to Cross-Site Scripting
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: Version 1.6.4 and below
Vulnerability Types: Cross-Site Scripting
Suggested CVSS v2.0: AV:N/AC:M/Au:N/C:N/I:N/A:N/E:U/RL:OF/RC:C (What's that?)
Release Date: March 28, 2012
Problem Description: Failing to properly sanitize user input, powermail is susceptible to Cross Site Scripting.
Solution: An updated version 1.6.5 is available from the TYPO3 extension manager and attypo3.org/extensions/repository/view/powermail/1.6.5/.
Credits: Thanks to David Henninger, Oliver Meyfarth and Security Team member Markus Bucher who discovered and reported this issue.
General advice: Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list to receive future Security Bulletins via E-mail.