Source: Tiffany Hsu and E. Scott Reckard, Los Angeles Times

MasterCard Inc. and Visa Inc. warned that some of the data in their cardholder accounts may have been breached. MasterCard said that it had notified banks, as well as law enforcement, of a potential problem with a third party "U.S.-based entity." An independent data security organization is conducting a forensic review, MasterCard said. The company's own systems haven't been compromised. Visa said the same.

Read Full Article: Visa, MasterCard warn of possible data breach