For further information on the issue in the extension powermail, please read the related advisory TYPO3-SA-2010-021 that was published today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2010-021/
Budget Idea Report: One-Click TYPO3 Playground
Łukasz Uznański shares the journey behind the technical achievement to implement a working proof-of-concept for TYPO3 running entirely in the browser…