More than a million customers of the Harbour Plaza Hotel group are being advised to be on their guard for possible scams after its booking database came under a cyber attack.
Privacy Commissioner Ada Chung said on Friday that she's probing the data leak involving 1.2 million customers, after receiving a report from the company on Wednesday.
Chung said her office is seeking to find out from the firm what type of personal data was involved in the incident.
People can check whether they are affected by the breach through the office's hotline at 2827 2827, the group's call centre at 3908 0740, or the company's website.
Customers are advised to check their payment cards to see if there are any unauthorised transactions, look for unusual email logins, change their relevant passwords and activate two-factor authentication.
They should also stay vigilant when they receive any suspicious calls, text messages or emails from people they don't know, officials said.
Chung also said her office is following up on a case regarding HKTVmall, which said it found suspicious activities late last month that led to the unauthorised access of a small amount of customer data.