On 16-12-2008 a security patch for RoundCube 0.2 Beta came available.
There were two security issues reported for RoundCube 0.2 Beta, which are now fixed. The first was as possible code injection using the html2text conversion script. The other exploit used the unchecked size parameters of the quota image to let PHP create huge images eating up all the server memory.
If you make use of the ROundCube 0.2 Beta package for ISPConfig 2, it is strongly recommended to install this patch file.
The patch file and readme file can be downloaded here