Banks claim credit card breach affected 94 million accounts

By Ross Kerber The Boston Globe

More than 94 million accounts were affected in the theft of personal data from TJX, a banking group has alleged in court filings, more than twice as many accounts as the retailer had said were affected in what was already the largest data breach in history.

The data breach affected about 65 million Visa account numbers and about 29 million MasterCard numbers, according to the court filing, which was made late Tuesday by a group of banks suing TJX over the costs associated with the breach. The banks cited sealed testimony taken from officials at the two largest credit card networks. A Visa official also put fraud losses to banks and other institutions that issued the cards at between $68 million and $83 million on Visa accounts alone, the filing states, the most specific estimate of losses to date.

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