For those who are not aware, update and reboot your systems.
In my own experience, my Wheezy OMV system is patched, but my Squeeze OMV system is not, even after a full update. I suppose we will have to wait for Debian to release a security patch. In the meantime I've disabled all port forwarding into my network.
While this isn't a specific OMV issue, it does affect OMV users, so any tips from the experts would be greatly appreciated.