We would like to thank Ekkehard Guembel and Michael Hirdes for writing the TYPO3 Security Cookbook. Thanks to the TYPO3 Security Team for their work for the TYPO3 project. A special thank goes to Stefan Esser for his books and articles on PHP security, Jochen Weiland for an initial foundation and Michael Schams for compiling the content in this document and coordinating the collaboration between several teams. He managed the whole process of getting this Security Guide to a high quality.