Hackers in China have leaked a database of an estimated 20 million hotel reservations on multiple websites and even WeChat, the wildly popular messaging service, reflecting failed government efforts to prevent massive leaks of personal data.
 
Online security watchdog WooYun said in September that hackers had taken advantage of a security loophole at CNWisdom, a Zhejiang-based company that calls itself the country's largest provider of wireless internet for hotels, to gain access to thousands of records of hotel bookings, including details such as phone numbers, e-mail addresses and residential addresses.

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