Forum Moderators: buckworks
It's been checked by plenty people. [google.com...]
The majority of security issues are user-related - for example:
Not obfuscating and not securing the Admin directory.
Incorrect configurations leading to leaked session IDs
Plus, it requires register globals to be enabled (or at least it did at last release), which can be a security risk in poorly coded scripts - one to be wary of if you do decide to go this route - watch out for those contributions, most of which are just really badly hacked together.