Xbox password flaw exposed by five-year-old boy
4 April 2014 Last updated at 19:21 BST
A five-year-old boy who worked out a security vulnerability on Microsoft's Xbox Live service has been officially thanked by the company.
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.
Michael Chen reports for KGTV, for ABC News.