6 June 2016 Last updated at 12:49 BST
The loophole could mean thieves who exploit the bugs gain time to break into and steal a vehicle.
The vulnerability can also be used to fiddle with some of the car's settings and drain its battery.
The wi-fi weaknesses have been demonstrated to Mitsubishi, which is now working on a way to fix them.
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The alarm on Mitsubishi's Outlander hybrid car can be turned off via security bugs in its on-board wi-fi, researchers have found.