Owner of Dublin's Westin Hotel caught up in global data breach affecting up to 500 million customers

Marriott has announced 500 million guests' data may have been exposed during breaches in a reservation database that began in 2014.

Names, email addresses and passport numbers are among the details affected by a data breach at the Marriott hotel group, which owns Dublin's Westin Hotel.

The data breach occurred after the guest reservation database of the chain's Starwood division in the US was compromised. A staggering 500 million guests' data may have been exposed during the breach, which began in 2014 and was spotted on September 8 this year. Guests who made bookings before September 10 this year may be affected.