TryPerl is a cloud IDE for Perl. It's still a feeble attempt at a Perl cloud IDE. More like a Perl Notepad. It asks to login via Github and each perl script created in TryPerl is a Gist on your github account.
Check it out live : http://www.tryperl.com (currently offline)
This is what it looks like:
I did however, make it work in the past with FreeBSD jails, Linux Containers and other crazy things but (like you guessed) there were security holes and I couldn't fix them.
I plan to use Docker to make this work. Here is post on stackoverflow where I tried to ask about it.
If you think you can help, please email me at gideon at cpan dot org or add an answer to the stackoverflow post.