Booking.com has been the victim of a data breach in which hackers gained access to customer details.

The reservation platform said “it noticed some suspicious activity involving unauthorised third parties being able to access some of our guests’ booking information.”

It continued: “Upon discovering the activity, we took action to contain the issue. We have updated the pin number for these reservations and informed our guests.”

The company has yet to disclose how many customers were affected in the breach. The company has reached out to affected customers via email saying that the responsible hackers may have been able to access information related to previous reservations.

Financial information had not been accessed as part of the data breach, Booking.com said.

“Based on the findings of our investigation to date, accessed information could include booking details and names, emails, addresses, phone numbers associated with the booking and anything that you may have shared with the accommodation,” the firm told affected customers.

The firm also informed customers that the incident has since been resolved.

It remains unclear what may have been behind the data breach, but Booking.com is not an uncommon target.

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The reservations giant faced a data breach in 2018, where hackers successfully phished for hotel login credentials, gaining access to the data of 4,000 customers.

In 2024, Booking.com reported that phishing attempts on its users had increased by 900%, as cyber-criminals increase their efforts with AI.

Booking is yet to disclose any more technical information regarding the breach.