Greg Steinhafel

Target says that its stores have been hit by a major credit card attack involving up to 40 million accounts. Chief Executive Officer Greg Steinhafel confirmed Thursday morning earlier reports that a brazen data breach had taken place. In a statement, Steinhafel said: "Target is working closely with law enforcement and financial institutions, and has identified and resolved the issue." The retailer said that the unlawful access to customer information took place between Nov. 27 and Dec. 15. Earlier, the Secret Service confirmed to USA TODAY that it's investigating the massive data violation involving shoppers’ personal credit card information.