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Data breach

KB Kookmin Bank employee app hack exposes 2,210 people's personal information

First reported · Last reported · 35 related reports

A hack of KB Kookmin Bank's employee app that began on 27 September exposed the personal information of customers and current and former employees, and the bank became aware of it three days after the attack began. A re-examination of the original incident identified 2,091 additional victims, increasing the total number affected from the initially announced 119 to 2,210. The exposed information included customers' account numbers, deposit balances, loan transaction histories and credit ratings, with the types of information exposed varying by individual.

Key facts

Affected organisation
KB Kookmin Bank
Incident type
Data breach
Occurred / detected
2026-09-27
Scale of damage
Personal information of a total of 2,210 customers and current and former employees
Cause / method
External hacking of an employee app
Location
South Korea

If your data was exposed

View KB Kookmin Bank notice ↗

Exposed dataBank accountUsage & purchase history

  1. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organisation’s official website or app.
  2. Turn on deposit and withdrawal alerts in your banking app. You can check all accounts in your name at once and request a payment suspension if needed.Account Info (integrated account management) ↗
  3. If you’ve suffered harm, report it. Call 118 (no area code) for privacy violations, contact the police for financial losses, and apply for dispute mediation to seek compensation.Personal Information Infringement Report Centre ↗Korean National Police Agency cybercrime report ↗Personal Information Dispute Mediation Committee ↗

Lookup and notice links are official pages found by AI. Make sure the address is on the organisation’s official domain before using it.

Timeline

  1. A hacking attack targeting KB Kookmin Bank began.
  2. It emerged that the employee app hack had exposed information belonging to 119 people, including 20 employees and 99 customers.
  3. A re-examination of the original incident revealed that the total number of people affected by the breach had risen to 2,210.
  4. It was disclosed that the additional victims comprised 1,631 customers and 460 employees, identified through analysis of the previously compromised system and business processes.
  5. It emerged that KB Financial Group had been reviewing for a month whether to file a disclosure with the US Securities and Exchange Commission.

35 related reports

The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organisation’s official statements for accurate details.