According to hotel management company White Lodging, Onity only started fixing its lock problem after the Hyatt had experienced its string of break-ins in early September.

Bad news: With less than $50 of off-the-shelf hardware and a little bit of programming, it's possible for a hacker to gain instant, untraceable access to millions of key card-protected hotel rooms.

Onity also offered to replace parts of each lock to permanently disable the security flaw, but said its clients would have to foot the bill.

The lock-picking tool—often referred to on the Internet as the “Onity hack”—takes less than 20 minutes to build, costs less than $40, and everything you need can be found at your ...

Police said the hotel-room hack, which works against an estimated 4 million keycard locks made by Onity, was used in a spree of crimes in several Arizona cities, including Phoenix, Mesa ...