A five-year-old San Diego boy has outwitted the sharpest minds at Microsoft - he has found a backdoor to the Xbox.

Kristoffer Von Hassel managed to log in to his father's Xbox Live account. When the password log-in screen appeared, Kristoffer simply hit the space button a few times and hit enter.

Robert Davies told KGTV-TV that just after Christmas he noticed his son playing games he supposedly could not access.

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Mr Davies, who works in computer security, said he reported the issue to Microsoft, which fixed the bug and listed Kristoffer on its website as a "security researcher".

A Microsoft statement said "we take security seriously" and thanked customers for highlighting issues.

It is not Kristoffer's first triumph. As a one-year-old, he bypassed a mobile phone toddler lock by holding down the "home" button.