A group of Chinese hackers earlier this year breached the computer network of LoopPay, which helps form the backbone of Samsung's new mobile payment system Samsung Pay. LoopPay executives told the New York Times that the hackers sought information on the company's magnetic secure transmission technology, which enables consumers to use Samsung Pay with payment terminals without NFC capability.

Will Graylin, LoopPay's CEO and the co-general manager of Samsung Pay, believes the hackers broke into the company's corporate network but not into the system that manages payments. 

"Samsung Pay was not impacted and at no point was any personal information at risk," Samsung said in a statement. "This was an isolated incident that targeted the LoopPay office network, which is a physically separate network from Samsung Pay."

The New York Times said LoopPay learned about the breach in late August, some five months after the initial intrusion. Executives from LoopPay and Samsung Pay said they hired professional security teams to investigate the breach.

Samsung Pay debuted in the U.S. last week after it launched a month prior in South Korea.