The recent Marriott data breach risked the privacy and creditworthiness of a half-billion guests who have stayed at the hotel chain since 2014, including those who booked through the Starwood reservation system that includes St. Regis, Westin, Sheraton and W Hotels, says global cybersecurity firm Stealthcare.

While Starwood had been breached in 2014, Marriott bought trouble when it acquired the brand in 2016 without discovering the hack, the company said this week.

To this day, Marriott does not know whether the hackers were able to decrypt the stolen credit card information, creating a ticking time-bomb for guests and the card-issuing banks, it added.

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