South Korea's Bithumb Confirms Data Breach After Cyberattack
Oct 28, 2026
Bithumb confirmed a data breach linked to an external cyberattack, with Daishin Securities and Mirae Asset also reporting customer data breaches in South Korea.
South Korea's crypto exchanges had a bad week. Bithumb, the country's second-largest exchange, confirmed that an unauthorized external party broke into its internal mobile groupware system, exposing customer data in the process.
Bithumb wasn't alone either. According to Yonhap News Agency, two other major financial firms, Daishin Securities and Mirae Asset Global Investments, also reported customer data breaches around the same time, though Bithumb's case is the one directly linked to an external cyberattack.
Why It Matters
South Korea has one of the most active retail crypto markets in the world, so a breach at a major exchange like Bithumb tends to ripple fast through user trust and trading volumes. Bithumb has a long history of security incidents, which makes repeat breaches especially frustrating for its user base.
No word yet on exactly how many users were affected or what data was exposed, but expect regulators to be watching closely.