It also revealed that a few days before Christmas, a major credit card company alerted banks about a breach that started in December 2013 and lasted until September 2014, although it didn't name the retailer. One of those banks told Krebs that the warning message included a list of 9,000 credit cards, with only Chick-Fil-A as the common point of purchase. "It's crazy," his source said, "because 9,000 customer cards is more than the total number of cards we had impacted in the Target breach."

While Chick-Fil-A has admitted that it could have been hacked, its statement still lacks pertinent details, citing the need for further investigation. Krebs believes only some outlets were affected, though, most likely via third-party point-of-sale systems, similar to what happened to Home Depot. The company hasn't determined yet whether customers' info were actually stolen, so it's probably wise to monitor your accounts if you've eaten at Chick-Fil-A since late 2013.

[Image credit: AFP/Getty Images]