Key facts
- Mirae Asset Securities said about 3,800 customer account numbers leaked in the two cyberattacks.
- Mirae Asset Securities said data on 35,255 current, former employees and contractors leaked.
- The leaked corporate data included names, employee ID numbers, email addresses, mobile phone numbers and passwords, the company said.
- Mirae Asset Securities said it reported the incident to South Korea's Financial Services Commission, Financial Supervisory Service and Personal Information Protection Commission.
Mirae Asset Securities Co. said on November 7, 2026 that it suffered cyberattacks that leaked account numbers of about 3,800 customers and personal information of 35,255 current, former employees and contractors, Yonhap reported.
The South Korean brokerage said unauthorized external access occurred on Wednesday and Thursday, targeting its mobile web phone authentication login service and an internal system, respectively. The leaked non-customer corporate data included names, employee ID numbers, email addresses, mobile phone numbers and passwords.
Mirae Asset said it immediately blocked the affected access routes after detecting suspicious activity from external IP addresses and activated its emergency response system. The company said it reported the incident to the Financial Services Commission, the Financial Supervisory Service and the Personal Information Protection Commission.