Excerpt from Yonhap News Agency, Published on October 28, 2026
Three South Korean financial firms — cryptocurrency exchange Bithumb, brokerage Daishin Securities and asset manager Mirae Asset Global Investments — reported cybersecurity incidents on October 28, raising concerns about a broader wave of attacks targeting the country’s financial sector. The incidents are under investigation by financial authorities, with the extent of the reported data exposure varying across the companies.
Bithumb reported that an external party had gained unauthorized access to its internal mobile groupware system, resulting in the leakage of personal information. The cryptocurrency exchange said it was investigating the scope of the incident, including whether customer information had been exposed. The compromised system was separate from Bithumb’s trading platform. No cryptocurrency funds were reported stolen in connection with the incident at the time of reporting.
Mirae Asset Global Investments also reported suspicious external access to some of its web systems. The company said it had blocked the access routes and activated its emergency response procedures. It reported no evidence that investor information had been compromised.
Daishin Securities confirmed that personal information belonging to 38,490 customers had been compromised. The exposed information included names, email addresses and mobile phone numbers. The brokerage said it was investigating the incident with authorities and had notified affected customers. South Korea’s Financial Supervisory Service is assessing the incidents, including conducting an on-site inspection at Daishin Securities.
The breaches come amid a wider series of cyberattacks affecting South Korean financial institutions. Earlier in October, authorities reported incidents involving 16 financial firms and institutions, with approximately 100,000 cases of personal information exposure reported at that stage. Investigations are ongoing, with authorities yet to identify those responsible or establish whether the three incidents are connected.
For additional information, read the original report from Yonhap News Agency.
