Release Date: June 3, 2014
Bulletin update: September 4, 2014 (affected version clarification)
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 2.3.0 and below of 2.x.x branch, version 3.0.0 of 3.x.x branch
Vulnerability Type: Cross-Site Scripting
Problem Description: The extension bundles flash files for video and audio playback. Old versions of FlowPlayer and flashmedia are susceptible to Cross-Site Scripting. No authentication is required to exploit this vulnerability.
Solution: Updated versions 2.3.1 and 3.0.1 are available from the TYPO3 extension manager and at http://typo3.org/extensions/repository/download/news/2.3.1/ and http://typo3.org/extensions/repository/download/news/3.0.1/t3x/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Markus Pieton and Vytautas Paulikas who discovered and reported the issues.