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The New York Times reports that some 20 million Visa and 13.9 million MasterCard accounts may have been compromised by “a computer security breach at a payment processing company, perhaps the single largest case of stolen consumer data to date.”

The FBI is investigating, which has been traced “traced to an intrusion at CardSystems Solutions of Tucson, Arizona, which processes more than $15 billion in payments for small and medium-size merchants and financial institutions each year.”

Another seven million accounts belonging to American Express and Discover also reportedly may have been compromised.

Only a small fraction of the accounts are said to be at risk.
KC's View:
“Small fraction” is relative. If you’re in that group, the fraction is way too big.