Marriott says data breach compromised info of up to 500 million guests

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By Erik Ortiz  with NBC News U.S. News
Image: A Marriott hotel in San Francisco, California
A Marriott hotel in San Francisco, California.   -   Copyright  Justin Sullivan Getty Images file

Marriott International said Friday that up to 500 million guests' information may have been accessed as part of a data breach of its Starwood guest reservation database.

The world's largest hotel chain said it determined on Nov. 19 that an "unauthorized party" had accessed the database as early as 2014.

"The company has not finished identifying duplicate information in the database, but believes it contains information on up to approximately 500 million guests who made a reservation at a Starwood property," Bethesda, Maryland-based Marriott said in a statement.

For about 327 million of the guests, it added, the information includes some combination of a name, mailing address, phone number, email address, passport number, Starwood Preferred Guest account information, date of birth, gender, arrival and departure information, reservation date, and communication preferences.