Target says a breach of credit and debit card data may have affected as many as 40 million shoppers who went to the store in the three weeks after Thanksgiving.
Target: 40 million credit cards compromised
The hackers targeted the systems at Target's brick-and-mortar stores, not the website.
OutFront: David Kennedy is CEO of TrustedSec and is a "white hat hacker" who looks for security flaws.
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