McDonald's Corp., the world's biggest hamburger chain, has been hit by an international data breach, CNN and Yahoo! News reported Saturday.
McDonald's said hackers stole some data from its systems in another example of cybercriminals infiltrating high-profile global companies. The infiltration on its network exposed the personal information of some customers in Taiwan and South Korea.
The hackers stole phone numbers, customer emails and addresses for delivery customers in South Korea and Taiwan, McDonald's said.
The company is contacting affected customers and said payment information was not compromised.
No customer data was breached in the U.S., The Wall Street Journal, which first reported the news, said.
McDonald's has notified some employees in South Africa and Russia about possible leakage of data, according to Hot Hardware.
The fast-food company credited its "substantial investment" in cybersecurity for detecting the breach.
"These tools allowed us to quickly identify and contain recent unauthorized activity on our network," a McDonald's representative told CNN Business.
McDonald's told personnel and franchisees to be on the lookout for suspicious emails and to use discretion when asked for information.
Hackers are targeting businesses across many sectors - including some high-profile cases in recent weeks.
JBS SA, the world's biggest meat processing company, last week said it had paid the equivalent of $11 million to cybercriminals who broke into its computer system in May.
Colonial Pipeline, the biggest pipeline system for refined oil products in the U.S., paid a ransom of 75 bitcoin last month - priced at $4.5 million at the time - to get its system back.
McDonald's said it will "leverage the findings" from an investigation and improve security measures.
