Hackers have obtained payment card data from another processor, according to Visa Inc., though many of the details, including the name of the company, remain unclear. Visa is notifying banks and credit unions that account numbers and expiration dates used in card-not-present transactions between February of last year and January were exposed at a U.S. processor, Computerworld reported Monday.

The San Francisco payments company confirmed to Computerworld that a processor "experienced a compromise of payment card account information from its systems," but did not identify the source of the breach.

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