Release Date: May 27, 2014
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: 2.0.2 and below, 1.5.0 and below
Vulnerability Type: Cross-Site Scripting
Problem Description: Failing to properly sanitize user input, the layout wizard provided by the extension gridelements is susceptible to Cross-Site Scripting. A valid backend user login with permission to access the layout wizard is required for this vulnerability to be exploited.
Solution: Updated versions 2.0.3 and 1.5.1 are available from the TYPO3 extension manager and at http://typo3.org/extensions/repository/download/gridelements/2.0.3/ and http://typo3.org/extensions/repository/download/gridelements/1.5.1/t3x/t3x/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Security Team Member Georg Ringer who discovered and reported the issue.