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Mastercard: Customers' Data Was at Risk Computer hackers got access to as many as 40 million credit card numbers, according to Mastercard. The card issuer says databases held by a third-party processing company were open to unauthorized access.

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Mastercard: Customers' Data Was at Risk

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Mastercard: Customers' Data Was at Risk

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Computer hackers got access to as many as 40 million credit card numbers, according to Mastercard. The card issuer says databases held by a third-party processing company were open to unauthorized access.