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Visa Warns of Cash-Register Flaw

Software Could Be Used To Steal Customers' Data From Credit, Debit Cards

Visa USA Inc. is warning that two versions of popular software installed at cash registers could be used to steal information from credit and debit cards.

The software, which is used by retailers to help ring up transactions, can be used -- sometimes inadvertently -- in a way that allows the cash register to store customer data, such as personal-identification numbers used in debit-card transactions. Under card-industry guidelines, retailers aren't supposed to store that information because it can fall into criminal hands if...