Massive Coupang Data Leak Caps Record Year for Cyber Breaches

A massive data breach at South Korea’s largest e-retailer Coupang Inc. caps what is set to be a record year for online leaks in the country, highlighting weaknesses in Seoul’s cyber defenses.

Coupang, known for its popular early morning grocery deliveries, said about 33.7 million customer accounts were affected by the leak, which compromised email and shipping addresses as well as phone numbers. Its US shares slid 9% in pre-market New York trading.

The figure — representing nearly two-thirds of South Korea’s 51.7 million population — would be a record if confirmed, an official from the Personal Information Protection ...