The U.S. Secret Service confirmed this morning that there has been a potential breach of security on some MasterCard and Visa accounts. The Secret Service declined to say when it first got word of the breach and whether any suspects had been identified.
MasterCard issued an official statement, saying "the incident is currently the subject of an ongoing forensic review." Visa had not issued a statement by Friday morning.
The Wall Street Journal reports that Global Payments - a transaction processing company - had some of its data apparently breached. According to the Journal, "it wasn't immediately known if banks are planning to reissue cards to their customers."
The Krebs on Security blog speculates that as many as 10 million credit cards may be involved and that the data theft took place between Jan. 21 and Feb. 25.