Two in three hotel websites unintentionally leak their ’ booking and personal data to third - party sites , such as analytics and marketing companies , a Symantec study of over 1,500 hotel websites across 54 countries has revealed . Information included names , credit card details , email addresses and passport numbers . Details are usually revealed when hotels send confirmation emails with a link that contains booking information , with a reference code that could be shared with over 30 service providers . The research followed Marriott International ’s recent disclosure of a significant data breach . The study, which looked at more than 1,500 hotel websites in 54 countries that ranged from two-star to five-star properties, comes several months after Marriott International disclosed one of the worst data breaches in history. Marriott was not included in the Symantec study .
Two in three hotel websites unintentionally leak their ’ booking and personal data to third - party sites , such as analytics and marketing companies , a Symantec study of over 1,500 hotel websites across 54 countries has revealed . Information included names , credit card details , email addresses and passport numbers . Details are usually revealed when hotels send confirmation emails with a link that contains booking information , with a reference code that could be shared with over 30 service providers . The research followed Marriott International ’s recent disclosure of a significant data breach . Marriott was not included in the Symantec study .