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Kristoffer Von Hassel, from San Diego, figured out how to log in to his dad's account without the right password.
Microsoft has fixed the flaw, and added Kristoffer to its list of recognised security researchers.
In an interview with local news station KGTV, Kristoffer said: "I was like yea!"
The boy worked out that entering the wrong password into the log-in screen would bring up a second password verification screen.
Kristoffer discovered that if he simply pressed the space bar to fill up the password field, the system would let him in to his dad's account.
Its just like Microsoft Windows desktop password. Its useless and very easy to crack. Not sure why Microsoft has a password protected OS.