Coming on the heels of other recent reports of wayward credit card data, MasterCard International has reported that a security breach at CardSystems Solutions, Inc. exposed more than 40 million credit accounts of all brands to potential fraud, including nearly 14 million MasterCard accounts. The data theft, which apparently occurred on or around May 22nd, included names, banks, and account numbers, but not social security numbers. Thus, the compromised data could be used to steal funds, but identity theft is less of a risk. American Express reported that a “small number” of customers were affected, whereas Discover wouldn’t confirm or deny whether or not its customers were affected, and Visa wouldn’t return calls.