How did they join?

Hello everyone!

Today someonemanaged to bypass my gmod sv_Password as you can see by thisSCREENSHOT
I have his SteamID and usedTHIS addon to try and scan for any back doors but couldn't find his SteamID anywhere.

Was wondering if anyone had any ideas?

Thanks for the help.

are you using a RCON password? they are not good at all, stay away

wow, this is scary, good try )) Rcon pass this is adminstrative for server...