Component Type: Third party extension. This extension is not part of the TYPO3 default installation.
Affected Versions: Version 1.1.9 and all versions below
Vulnerability Type: Cross Site Scripting
Solution: An updated version is available from the TYPO3 extension manager and at typo3.org/extensions/repository/view/powermail/1.1.10/
General advice: Follow the recommendations that are given in the <media 800 - external-link-new-window>TYPO3 Security Cookbook</media>. Please subscribe to the typo3-announce mailing list to receive future Security Bulletins via E-mail.
Credits: Credits go to security team member Marcus Krause, who discovered the issue. Furthermore the TYPO3 Security Team wishes to thank the authors Alexander Kellner and Mischa Heissmann. After being informed by the TYPO3 Security Team about the presence of a security issue, they have fixed the issue quickly.