Your maximum liability under federal law for unauthorized use of your credit card is $50 (many financial services companies have different policies so be sure to check with each of them). If the loss involves your credit card number, but not the card itself, you have no liability for unauthorized use; in general, you may only be liable for a very small amount but always check with your individual card company for their exact policy.
Equifax – www.equifax.com
Experian – www.experian.com
Trans Union – www.transunion.com