Hackers managed to compromise payment cards used at 250 Hyatt Hotels locations in around 50 countries after infecting the company’s payment processing systems with malware.

Hyatt announced the data breach back in December and launched an investigation. On Thursday, it published the full list of affected locations and the time interval during which the payment cards were exposed: Aug 13. to Dec. 8.

Most of the potentially compromised cards were used at restaurants in the affected locations, but a small percentage were used at spas, golf shops, parking systems, front desks and sales offices.

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