Release Date: August 18, 2009
Component Type: Third party extension. This extension is not part of the TYPO3 default installation.
Affected Versions: Version 0.9.8 and below.
Vulnerability Type: (Persistent) Cross-Site Scripting (XSS)
Solution: After you have retrieved a current list of available plugins from the TYPO3 Extension Repository, Commerce version 0.9.9 is available from the TYPO3 extension manager. Alternatively, you can manually download the T3X file containing the security update from typo3.org/extensions/repository/view/commerce/0.9.9/.
In case you are using a DEV version from the Subversion repository of Commerce, please sync to revision 23434 or higher (trunk). There is also a branch (0.9.x) available for Commerce version 0.9.x which contains the security fix as of revision 24333.
Credits: Credits go to Fabian Friedrich who discovered the issue. Furthermore the TYPO3 Security Team wishes to thank the Commerce team for fixing this issue.