Did you shop at GameStop's online store for the holidays, or take advantage of its post-holiday clearance sales? You might want to check your credit card statement. GameStop has confirmed to security guru Brian Krebs that it's looking into a possible data breach that compromised credit card info between September 2016 and February 2017. Krebs' financial industry sources claim that the intruders not only took card numbers, expiration dates and cardholder addresses, but the three-digit security number that's ordinarily hard to get (as it's not usually stored online). This suggests the attackers planted malware on the site to harvest the info before it was transmitted -- this was clearly not a run-of-the-mill breach if so.