[cobalt-developers] Is it safe to give a client Telnet access?

["W." <w_too@xxxxxxxxxxx>]

Is it correct to assume that when I grant a client/virtual site telnet
access, that he can see each and every file on the server?
So in other words, if I gave shell access to client A, and client B has an
online shop and stores order info in flat text files, client A would be able
to see client B's order info. Right?

If this is correct, is there any solution for this?

Thank you in advance,
William.