Back in January, arts and crafts retail giant Michaels announced that it was investigating a potential security breach, and now the company has confirmed that millions of credit cards may have been compromised by a cyberattack. Overall, some 2.6 million credit and debit cards may have been affected, which is about seven percent of cards used in its stores over that timeframe. The Michaels website has details on what specific stores were targeted and at what times they were vulnerable, so concerned customers can go and check to see if their credit card info was potentially hacked. While it appears that credit card numbers were exposed thanks to the hack, Michaels says that personal customer info like names, addresses, and PIN numbers were not compromised.