You might have just found out that your credit card number may be compromised. Target reports that up to 40 million customers may have had their names, card numbers, expiration date and security code stolen via hacked credit card checkout scanners. Here’s how to find out if you’re one of them, and what to do next. Step 1: Find out if you’re affected. In Target’s case, anyone who shopped in a brick-and-mortar store in the US between November 27th and December 15th is potentially at risk (the company says Target.com shoppers were not affected). If you set foot in a Target store during that time, check your credit card statements immediately, and call your credit card company for good measure — even if your account hasn’t got any weird charges on it, your company may offer to cancel your card and issue a new one just to be safe.