https://arstechnica.com/gadgets/2021/11/new-book-claims-us-intel-agency-hacked-booking-com-in-2016/

A hacker working for a US intelligence agency breached the servers of Booking.com in 2016 and stole user data related to the Middle East, according to a book published on Thursday. The book also says the online travel agency opted to keep the incident secret.

Amsterdam-based Booking.com made the decision after calling in the Dutch intelligence service, known as AIVD, to investigate the data breach. On the advice of legal counsel, the company didn’t notify affected customers or the Dutch Data Protection Authority. The grounds: Booking.com wasn’t legally required to do so because no sensitive or financial information was accessed.