It happens to every one on the server - and if you mean by "hacked" that some one has broken through firewalls, etc and is doing stuff system side, then no.
The cheater can do it in any server at will. Once he is banned/punted it will stop as it can only be done if he is in the server.
If your just visiting the server, best thing you can do is take a screen shot, jot down the date, time and map name and some how pass it to that server's admin (forum, email, etc).
IcI
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