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Today I restarted my Mac book Pro and the guest user was on when has always been off before.

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One of my colleague had the same problem. – Chris Cinelli Jun 13 '13 at 19:28
Hi Chris, welcome to Information Security. Your question is kinda borderline - please take a look at the FAQ to see what kind of questions we expect here - but I think for now we'll let it be. Can you add more information, like did you do anything different? If I had to guess, I would say a recent update probably flipped it back on... – AviD Jun 13 '13 at 19:39
No updates. But I had some updates that I had to run... – Chris Cinelli Jun 13 '13 at 19:49
The only thing that I did out of the ordinary was turning on "Find my Mac" – Chris Cinelli Jun 13 '13 at 19:50

Apparently was turning on "Find My Mac" that turned on the guest account:

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That is interesting, thanks for sharing... Actually now there is room to ask about the security of this "feature" ;-) – AviD Jun 13 '13 at 20:09

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