The hotels range from Hawaii and California to Texas and the East Coast. You can see a full list of the affected properties and how long the breach extended at each one in this PDF.
While this is a serious breach, there could be an even bigger one on the horizon. Banks and card issuers tracking the Starwood breach suspect that one has taken place at Hilton Hotels & Resorts as well.
They're seeing a lot of fraudulent activity linked back to Hilton restaurants and gift shops, along with Hilton properties such as Embassy Suites, Doubletree, Hampton Inn and Suites, and Waldorf Astoria Hotels & Resorts.
Again, this would be a problem with malware-infested POS systems, just like most other major retailer breaches of the past two years. If you swiped your card at a Starwood or Hilton property for the last year, keep a close eye on your bank statements for any unusual activity.
Hopefully, this problem should become a thing of the past once EMV credit cards finally come into effect. Find out why these chip-based cards are safer than swipe cards.