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Target had suffered a data breach around the time of 2013 Black Friday

A report from a respected security researcher says that Target had suffered a data breach around the time of Black Friday last month "potentially involving millions of customer credit and debit card records."

Target did not respond to requests for comment Wednesday evening.

The report says that the breach apparently targeted customers at stores rather than online shoppers. The thieves reportedly gained access to data on the magnetic strips of shoppers' cards, potentially allowing them to produce counterfeit versions.

The thieves could also potentially withdraw cash from ATMs using counterfeit debit cards if they were able to intercept PIN data from Target.