200,000 Taiwanese accounts affected in Coupang data breach

Coupang announced that approximately 200,000 Taiwanese accounts were involved in a recent data breach affecting around 33 million accounts overall.

The company commissioned external cybersecurity firms to investigate the incident, which occurred in November 2025. Coupang attributed the breach to a former employee, stating that the individual accessed the accounts without authorization.

The company said no highly sensitive data was accessed and no misuse of customer data has been detected.

Earlier investigations confirmed that more than 33.6 million accounts were affected overall. The company faced criticism for initially claiming that only 3,300 accounts were compromised.

🔗 Source: Yonhap

🧠 Food for thought

Implications, context, and why it matters.

A single unrevoked key led to a multi-billion dollar fallout

South Korean authorities said a former employee carried out the breach. The person had worked on Coupang’s authentication systems, knew weaknesses in the authentication framework, and understood gaps in the key management system 1.
In December, Coupang replaced CEO Park Dae-jun with Harold Rogers. The company also faced scrutiny over a roughly US$1.2 billion compensation plan 1.
The breach sparked multiple lawsuits. A plaintiffs’ firm said the CEO resignation and the compensation plan erased more than $8 billion in market value, amid claims that investors were misled about Coupang’s security protocols 2.

The data breach is now a flashpoint in U.S.-Korea trade relations

Major U.S. investors filed a notice with South Korea’s Ministry of Justice. They also plan to seek investor–state dispute settlement (ISDS) arbitration under the U.S.-Korea Free Trade Agreement 1.
The investors argue the government’s tough regulatory response amounts to discrimination. They say it aims to help Coupang’s Korean and Chinese competitors 1.
U.S. lawmakers called the investigation a “politically motivated witch hunt” 3. The dispute also fed speculation about a U.S. move to raise tariffs on South Korean goods 3.