SAN FRANCISCO (CBS SF) – Starwood Hotels announced Friday that hackers were able to access credit and debit card information for people who ate and shopped at more than 50 of its hotels. Two of the impacted hotels are located in San Francisco.

According to a statement from Starwood, point of sale systems at 54 hotels were infected with malware, allowing hackers to access card information including card numbers, the names of cardholders and security codes. The affected terminals were located in some restaurants, gift shops and other point of sale systems.

Starwood said there is no evidence that Social Security numbers or PIN numbers were affected and that the breach did not impact their reservation system or guest reward program.

The issue was found at Starwood hotels in several dozen US cities, including New York, Chicago, Los Angeles and Honolulu. In the Bay Area, the Palace Hotel and the Westin St. Francis in San Francisco were among the hotels impacted by the breach.

Payment systems at two hotels in Montreal, Canada and one in Puerto Rico were also breached. A full list can be found here (.pdf).

Starwood said the hotels have taken steps to secure customers’ card information and that affected guests can obtain one year of free identity protection and credit monitoring services.