Component Type: Third party extension. This extensions is not part of the TYPO3 default installation.
Affected Versions: Version 2.5.24 and all versions below.
Vulnerability Type: Cross Site Scripting
Release Date: 14.04.2010
Solution: Updated versions are available from the TYPO3 extension manager.
Users are advised to upgrade to extension version 2.5.25 which is available at http://typo3.org/extensions/repository/view/sr_feuser_register/2.5.25/
Credits: Credits go to Chris John Riley, who discovered and reported the issue.