Bukkit/Minecraft Vanilla Auth hacked again.

Hello, I run a small server with about 100 players. Today I was informed by another admin on my server that someone has logged in to my account. Impossible, so I though. When further tracing the "hacker" I see that this person has logged in with several diffrent accounts and multiple tries and sometimes failed.

I don't know any more than this, don't know how to trace packets or anything advanced. Just a warning to everyone.

Code:

[INFO] Disconnecting XXXXX [/xxx.xxx.xxx.xxx:64833]: Invalid client reply
[INFO] Disconnecting XXXXX [/xxx.xxx.xxx.xxx:8432]: Invalid client reply
[INFO] Disconnecting XXXXX [/xxx.xxx.xxx.xxx:64851]: Failed to verify username!
[INFO] Disconnecting XXXXX [/xxx.xxx.xxx.xxx:64860]: Failed to verify username!
[INFO] Disconnecting XXXXX [/xxx.xxx.xxx.xxx:3984]: Invalid client reply
[INFO] Disconnecting XXXXX [/xxx.xxx.xxx.xxx:64878]: Failed to verify username!
[INFO] XXXXX [/xxx.xxx.xxx.xxx:35626] logged in with entity id 70456 at ([world] 1324.0364554397088, 56.0, 1006.4351210573794)

Very funny.. this just in:

Code:

[INFO] Notch [/xxx.xxx.xxx.xxx:56542] logged in with entity id 128216 at ([world] 1337.4738373944715, 57.24918707874468, 678.6670469043737)

online-mode=true
Craftbukkit devbuild 1.6.2 R0.2 Build#02866

 

type /version. does it say the version is #2866?