Seoul: South Korean online platforms were seen carrying out emergency reviews of their data protection status, with Coupang Inc. widely expected to face major fines following a data breach, sources said Monday.

According to Yonhap News Agency, on Saturday, the U.S.-listed e-commerce giant said personal information of 33.7 million customers has been compromised, far higher than the 4,500 cases it initially believed to have been affected.

The figure indicates that nearly all Coupang users may have had their personal information, including names, phone numbers, email addresses and delivery details, leaked.

Coupang, which provides overnight delivery of fresh food and daily necessities, is one of the most widely used shopping platforms in South Korea with 34 million monthly active users in November, up 0.68 percent from a month earlier.