They think this might be one of the largest breeches to date. They think this information was obtained because of software installed on machines customers swipe their credit cards on. The secret service is investigating and I hope they catch them.Payment card data was stolen from an unknown number of Target Corp. customers starting on the busy Black Friday weekend in a major breach at the U.S. retailer, according to a person familiar with the matter.
Target customers hit in major credit card security breach - CBS News
If I was at a Target store on black Friday up until December 15th I would have my account number changed.