The Coppermine version in fantastico is a rather old version and I believed it was this version that some sort of security problem. You should upgrade your installation to the latest version (1.4.4) as soon as possible.
Unfortunately the Coppermine site seems to be down at the moment, but please check it from time to time and download the latest version and upgrade your installation.
The install package contains a step by step guide how to upgrade it, or if you run into any problems we can usually help you solve them here.