According to ComputerWorld, which has it from the IDG news service, Mastercard has revealed that up to forty million (40,000,000) credit card numbers may have been acquired by a malicious hacker attacking CardSystems Solutions Inc, a company that provides back end services for card companies. Of those 40 million, roughly 13.9 million may have been Mastercards so Mastercard are not the only company affected, they are just the only one thus far to warn the public about it.
The point of the article, seems to be that if you have a credit card, you should check your statements regularly either online or via your bank statements and be sure contest or charge back any payments you didn’t make if there are any. (But you’re doing that already right?)
