(BBC News) Millions of electronic door locks fitted to hotel rooms worldwide have been found to be vulnerable to a hack.
Researchers say flaws they found in the equipment's software meant they could create "master keys" that opened the rooms without leaving an activity log.
The F-Secure team said it had worked with the locks' maker over the past year to create a fix.
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But the Swedish manufacturer is playing down the risk to those hotels that have yet to install an update.