The Marriott hotel chain discovered that since 2014, the hotel's Starwood hotel network was unauthorized access, so the information to 500 million people who were left in the chain were endangered.
It has been reported today that hackers might copy credit card numbers and expiration dates for some of their guests. Approximately 327 million people, the information displayed includes a combination of names, emails, phone numbers, passport numbers, special Starwood Special Guest, date of birth, sex, arrivals and departures and communication preferences.
For other users, the filtered information was limited to name, and sometimes to data such as emails and other information. According to the company, this leaves the number of 500 million affected customers.
The Marriott said it had been missing a database in September that had information about Starwood's reservations before September 10th.
Starwood Hotel offers hotels called W Hotels, St. Regis, Sheraton hotels and resorts, Westin hotels and resorts, Element hotels, Aloft hotels, Luxury collection, Tribute Portfolio, Le Meridien hotels and resorts, Four Points by Sheraton and hotel design as well as properties in common weather.
Marriott International Inc. discovered the investigation by someone who copied and encrypted the guest information and attempted to remove it.
The Marriott and Starwood joined two years ago and tried to combine their loyalty programs for hotels that were damaged by technical difficulties.
Marriott CEO Arne Sorenson said on Friday that Marriott was still trying to break Starwood systems.
The company has enabled the website and phone center for anyone who thinks their data is compromised, and Friday has started sending emails to those who are affected.