How many people were affected by the KB Kookmin Bank data leak, and who were they?

The total reached 2,210 people: 119 confirmed on Oct. 2 and 2,091 identified in a later examination. The additional group comprised 1,631 customers and 460 company executives and employees.

Why did KB Kookmin Bank identify more people affected by the data leak?

The bank said it found the additional cases by closely examining data and processes connected to the system that was initially attacked. It said the increase did not result from another hacking attack.

What personal information did KB Kookmin Bank say was exposed in the initial cases?

The bank had earlier said the leaked information for the 119 people initially confirmed included their names, phone numbers and addresses.

KB Kookmin Bank finds 2,091 more people affected by data leak

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Summary

KB Kookmin Bank said Monday that 2,091 additional people were found to have had personal information compromised in a hacking incident early this month. The total number affected rose to 2,210, including 119 people confirmed on Oct. 2. The bank said the increase came from a closer examination of data and processes, not another hacking attack.

Key Facts

The newly identified group includes 1,631 customers and 460 company executives and employees.
The bank had previously said information leaked from the 119 initially confirmed cases included names, phone numbers and addresses.
A bank official apologized for not determining the scale of the breach accurately in the early stages and said the bank would work to prevent a recurrence and protect customers.
KB Kookmin Bank was among more than a dozen financial institutions hit by back-to-back hacking cases early this month.

By Yonhap

Published Oct 26, 2026 8:17 pm KST

A man passes a branch of KB Kookmin Bank in Seoul, Oct. 11. Yonhap

KB Kookmin Bank said Monday an additional 2,091 people were found to have had their personal information compromised in a hacking incident early this month.

The discovery increased the total number of people affected to 2,210 after 119 people were confirmed on Oct. 2 to have had their personal data leaked.

The additional people comprise 1,631 customers and 460 company executives and employees, the bank said.

The increase was not caused by any additional hacking attacks and was discovered through a close examination of data and processes connected to the system that initially came under attack, it said.

"We are sincerely sorry to our customers for not having been able to determine (the scale) perfectly in the early stages," a bank official said. "We will do our best to prevent a recurrence and protect our customers."

The bank had earlier said the leaked information included the names, phone numbers and addresses of the 119 people.

KB Kookmin was one of more than a dozen financial institutions that suffered back-to-back hacking cases early this month.

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