In 2007, retailer TJX announced that its systems had been breached by hackers. Some of the largest retailer breaches to date may help explain what happened in this case. A third source at a data breach investigation firm said it appears that вЂњwhen all is said and done, this one will put its mark up there with some of the largest retail breaches to date.вЂќ But the sources I spoke with from two major card issuers said they have so far been notified by one of the credit card associations regarding more than one million of cards total from both issuers that were thought to have been compromised in the breach. ItвЂ™s not clear how many cards thieves may have stolen in the breach. If the thieves also were able to intercept PIN data for debit transactions, they would theoretically be able to reproduce stolen debit cards and use them to withdraw cash from ATMs. The type of data stolen - also known as вЂњtrack dataвЂќ - allows crooks to create counterfeit cards by encoding the information onto any card with a magnetic stripe. There are no indications at this time that the breach affected customers who shopped at TargetвЂ™s online stores. вЂњWe canвЂ™t say for sure that all stores were impacted, but we do see customers all over the U.S. bank card issuer who asked to remain anonymous. вЂњThe breach window is definitely expanding,вЂќ said one anti-fraud analyst at a top ten U.S. According to sources, the breach affected an unknown number of Target customers who shopped at the companyвЂ™s bricks-and-mortar stores during that timeframe. But over the past few days, investigators have unearthed evidence that the breach extended at least an additional week - possibly as far as Dec. Representatives from MasterCard and Visa also could not be immediately reached for comment.Д«oth sources said the breach was initially thought to have extended from just after Thanksgiving 2013 to Dec. has not responded to multiple requests for comment. 15, 2013.ДЄccording to sources at two different top 10 credit card issuers, the breach extends to nearly all Target locations nationwide, and involves the theft of data stored on the magnetic stripe of cards used at the stores. ET: Target released a statement this morning confirming a breach, saying that 40 million credit and debit card accounts may have been impacted between Nov. The sources said the breach appears to have begun on or around Black Friday 2013 - by far the busiest shopping day the year. Nationwide retail giant Target is investigating a data breach potentially involving millions of customer credit and debit card records, multiple reliable sources tell KrebsOnSecurity.

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