Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: Version 0.9.3 and below
Vulnerability Type: Cross-site scripting
Release Date: July 3rd, 2012
Problem Description: Failing to properly sanitize some record data in the FE and BE, seminars is susceptible to cross-site scripting.
Solution: An updated version 0.9.4 is available from the TYPO3 extension manager and at http://typo3.org/extensions/repository/view/seminars/0.9.4/.
Due to some changes related to the security update of ameos_formidable, the HTML template for the registration form needed to be changed. If you are using a modified HTML template for the registration form, please read the extension manual concerning how you will need to modify the HTML template.
Credits: Thanks to Alex Kellner who discovered and reported this issue.