Archive · 2 Oct 2026
KB Kookmin Bank Breach Raises Fears After Shinhan Leak
KB Kookmin Bank said hackers stole information from more than 100 customers.
The information included names, phone numbers and encrypted identification details.
The bank said it would pay for any damage caused by the leak.
This happened soon after Shinhan Bank reported a much larger leak involving about 25,000 customers.
Shinhan said names, phone numbers, annual incomes and loan information were exposed.
The hackers are suspected of being based outside the country.
Experts think AI tools may have helped attackers find weaknesses in online systems.
They are urging banks to check their security and stop unusual access attempts.
Personal data from more than 100 KB Kookmin Bank customers was reportedly stolen through hacking.
The exposed KB Kookmin information included names, phone numbers and encrypted identification data.
KB Kookmin Bank said it would fully compensate customers for any damage caused by the breach.
Shinhan Bank separately reported that information from about 25,000 customers had been leaked.
Experts warned that AI-assisted attacks may threaten financial institutions and urged banks to inspect their systems.
- Who
- KB Kookmin Bank and Shinhan Bank customers; suspected overseas hackers; financial-industry security experts.
- What
- Customer information was leaked from both banks through hacking, with more than 100 KB Kookmin customers and about 25,000 Shinhan customers affected.
- When
- The KB Kookmin breach was reported on Friday, following Shinhan Bank's disclosure on Thursday; the Shinhan leak occurred on Wednesday.
- Where
- The affected banks are in Seoul, and the attacks involved vulnerable online platforms.
- Why
- Sources and experts said hackers may have used advanced AI tools to exploit vulnerable platforms, prompting calls for stronger inspections and monitoring.
Bank Response
Security Concerns
Handling customer harm
Bank Response
KB Kookmin Bank said it would fully compensate customers for any damage caused by its breach, while Shinhan Bank said it took emergency measures to minimize potential harm.
Security Concerns
The leaks raised broader concerns that customer information across the financial industry could be exposed through similar attacks.
Nature of the attacks
Bank Response
Sources said Shinhan Bank may not have been specifically targeted and could have been caught in random attacks against vulnerable online platforms.
Security Concerns
Experts warned that AI-assisted attacks can exploit weaknesses across financial institutions, requiring banks to conduct prompt security inspections and block abnormal access.
- KB Kookmin customers affected
- More than 100
- KB Kookmin data exposed
- Names, phone numbers and encrypted identification data
- KB Kookmin response
- The bank said it would fully compensate possible damage
- Shinhan customers affected
- About 25,000
- Shinhan data exposed
- Names, phone numbers, annual incomes and loan information
- Suspected attack method
- Hacking assisted by advanced artificial intelligence tools
- Industry concern
- Financial institutions may be vulnerable to AI-assisted attacks