McDonald's Corp. said hackers exposed U.S. business information and some customer data in South Korea and Taiwan.
Last week, the burger chain said it had hired external consultants to investigate unauthorized activity on an internal security system, prompted by a specific incident in which the unauthorized access was cut off a week after it was identified, McDonald’s said. The Wall Street Journal, which first reported the news, says that the company's data was breached in the U.S., South Korea and Taiwan. Data that was reportedly accessed included restaurant information, such as square footage, but not "sensitive or personal" customer or employee data. However, the company asked employees and franchisees to look out for phishing emails and to use discretion when asked for information.