So recently on my server, someone or some group has been logging in as any account they please. My account, the other owners account, the admins, even some accounts with really generic names like "Curry" or "Poni" or even the name of my old server "ultraminecraft". No idea how they are doing this. My server is NOT in offline mode, I am using multicraft with a host known as Intreppid. I am using the latest beta build of CraftBukkit. What is going on here? How are these people logging into my server like this? I've never seen or heard this kind of hack before and I never even thought was possible! This could very well affect other servers too since these hackers can obviously login as anyone they want. Maybe it's just some flaw with my server? I'm not sure but it's really scaring me here.