Four giant card-payment processors and large U.S. banks that issue debit and credit cards were hit by a data-security breach after third-party services provider Global Payments Inc discovered its systems were compromised by unauthorized access.
It was not immediately clear how many cardholders became victims of the breach, which affected MasterCard Inc, Visa Inc, American Express Co and Discover Financial Services, as well as banks and other franchises that issue cards bearing their logos.