ARLINGTON, VA — Although neither Visa nor MasterCard have released any data yet, the card brands have been telling processors and issuers that the number of card accounts compromised in the breach of Heartland’s Payment Systems data security will range from at least 80 million up to slightly more than 100 million.

Sources familiar with card processing declined to speak for the record since they had not been authorized to speak for the press on this issue, but they said nonetheless that the scope of the Heartland breach dwarfs the breach at TJX in 2007 and CardSystems Solutions in 2005. TJX owned up to over 45 million cards compromised, though later litigants claimed a higher figure. Eventually, 40 million accounts compromised were laid at the feet of CardSystems.

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