Hyatt has advised customers to review their credit card statements after discovering malicious software on its payment systems.
The hotel giant said the discovery of the malware in November raised the possibility that hackers may have gained access to sensitive information including credit card numbers.
A statement from Chuck Floyd, global president of operations, said: “Protecting customer information is of critical importance to Hyatt, and we take the security of your payment card data very seriously.
“We recently identified malware on computers that operate the payment processing systems for Hyatt-managed locations. As soon as we discovered the activity, we launched an investigation and engaged leading third-party cyber security experts.”
It added: “As always, we encourage customers to review their payment card account statements closely and to report any unauthorized charges to their card issuer immediately.
“Payment card rules generally provide that cardholders are not responsible for unauthorized charges that are timely reported.”