Source: Security Fix
Payment processor, Heartland Payment Systems, has discovered malware on its infrastructure which was leaking out card data. The compromised data includes names, credit and debit card numbers, and expiration dates. The extent of compromise is unknown, but assumed to be very large because the company processes on the order of a hundred million transactions per month. The existence of the breach has been known since late last year, but the malware was only recently discovered as the cause.