119 KB Kookmin Bank Customer Records Leaked... "Full Compensation for Any Damages"
External Breach of Employee Mobile Support System
Leakage of Customer Names, Phone Numbers, Addresses, and Encrypted ID Numbers
Unrelated to Internet or Mobile Banking; Full Compensation Guaranteed for Any Damages
It has been confirmed that the personal (credit) information of 119 individuals was leaked due to an external breach at KB Kookmin Bank. KB Kookmin Bank stated that it will fully compensate customers should any damages arise from this information leak.
According to KB Kookmin Bank on October 2, 2026, on the night of September 30, there was an abnormal external access through which personal information was leaked from the employee mobile support system. However, the bank clarified that this was not related to customer financial transactions such as internet banking or mobile banking. The leaked information includes the customer's name, phone number, address, and encrypted resident registration number.
After confirming the information leak, KB Kookmin Bank completely blocked the relevant server and access route to prevent further damage. The bank also individually notified affected customers regarding the information leak and provided guidance on how to prevent secondary damages. Additionally, to ensure prompt response to damage reports and related inquiries, the bank decided to operate a dedicated customer support center separate from the main call center.
KB Kookmin Bank plans to fully compensate customers should they incur damages as a result of this information breach.
A representative from KB Kookmin Bank stated, "We take this situation extremely seriously and have implemented a company-wide emergency response system, thoroughly reviewing all related processes from scratch to prevent further harm and recurrence in the future."
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Previously, it was confirmed on October 1 that at Shinhan Bank, unauthorized external access led to the information leakage of approximately 25,000 customers, including personal and credit information such as customer names, phone numbers, annual income, and loan calculation limits.
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