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My bank has a notice of this on their website this morning, they have automatically canceled all cards for anyone that made a purchase at Target during this period.
http://online.wsj.com/news/articles/SB10001424052702304367204579267992268980478
There are a variety of methods used to steal credit-card and debit-card numbers. In this case, malicious software, or malware, made its way onto Target's point-of-sale terminals—the red credit-card swiping machines in checkout aisles, according to people familiar with the breach investigation.
The affected data included customer names, credit- and debit-card numbers, expiration dates and three-digit security codes embedded in the magnetic stripe, according to a notice posted for customers on the Target website.
Target was thrust into crisis mode Thursday after a massive theft of customer credit-card data threatened to dent the discounter's reputation and hurt sales during the final days of holiday shopping.
News of the data breach broke on Wednesday. On Thursday, after Target disclosed that 40 million credit- and debit-card accounts had been compromised in the breach, which ran from Nov. 27 until Dec. 15, anxious customers clogged the chain store's phone lines, jammed its credit-card website, and left angry posts on the corporate Facebook page.
Target, which discovered the problem Sunday, brought in the Secret Service and alerted card companies. Target also hired a forensics unit at Verizon Communications Inc. VZ -0.08% to investigate the incident, according to people familiar with the matter.
http://online.wsj.com/news/articles/SB10001424052702304367204579267992268980478