I just updated to 10.9.4 Maverick, and now I get a guest user at login.  It was never there before.  I'm concerned someone has tried to hack in.

(Aug. 21, 2014)I just updated to OS-X Maverick 10.9.4, and now I get a guest user option at login.  I never saw this before and didn't change any settings.
Could I have been hacked?

Could be two reasons
1.Have you turned on Find My Mac? Guest user is enabled if you have as a trap for the thief.
2. Check System preferences> Users and Groups. Is there a guest user here? If so uncheck the Allow guests to log into this computer.
Hope this helps.
PJRS

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