Security researchers have discovered a way to hack a widely used model of electronic keys, adopted by more than forty-two thousand hotels in one hundred and sixty-six countries.
The researchers reported the vulnerability to the manufacturer about a year ago, and earlier this year the manufacturer provided customers with patches for the central server software. The firmware on each lock also needs to be upgraded by someone who is physically present at the lock. There's no way to determine how many of the locks have received the upgrade.
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