"We recently noticed suspicious activity affecting a number of reservations, and we immediately took action to contain the issue," Booking.com wrote. "Based on the findings of our investigation to date, accessed information could include booking details and name(s), emails, addresses, phone numbers associated with the booking, and anything that you may have shared with the accommodation."
Amsterdam-based Booking.com has now generated new PINs for customer reservations to prevent hackers from accessing them. Still, the incident risks exposing affected customers to potential phishing scams. The Australian Broadcasting Corporation and several Reddit users say they received scam messages from accounts posing as Booking.com.