If you often leave your valuable and expensive stuff like laptop and passports in the hotel rooms, then beware. Your room can be unlocked by not only a malicious staff having access to the master key, but also by an outsider.
A critical design vulnerability in a popular and widely used electronic lock system can be exploited to unlock every locked room in a facility, leaving millions of hotel rooms around the world vulnerable to hackers.
The vulnerability has been discovered in Vision by VingCard locking system—made by the world’s largest lock manufacturer, Assa Abloy, and deployed in more than 42,000 facilities in 166 different countries, which equals to millions of doors.
images from Hacker News