In what could be the largest data security breach to date, MasterCard International on Friday said information on more than 40 million credit cards may have been stolen.
Of those exposed accounts, about 13.9 million are for MasterCard-branded cards, the company said in a statement. The other brands affected have not been identified. MasterCard has notified its member banks of the specific accounts involved so the banks can take action to protect cardholders, MasterCard said.
“In sheer numbers, this is probably one of the largest data security breaches,” said James Van Dyke, principal analyst at Javelin Strategy & Research in Pleasanton, Calif.
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