Web security has been a hot topic over the last few weeks, in the news and here at the ARK dev team. We have just finished working on a big overhaul of the guts of ARK that will make your web front end much more secure. If you are using ARKv1.1 it should be very easy to upgrade your ARK following the upgrade instructions.
The code is available on our sourceforge page: Download
We recommend upgrading as soon as possible to close the vulnerabilities that existed in the previous versions of ARK.