INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Naver Employees' Customer Info Leaked Due to Permanent Access Vulnerability

| 2026-10-29 07:49 MEDIUM LOW DATA BREACH
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Executive Summary
AI-generated
On October 27, 2026, hackers accessed Naver's Bithumb Exchange internal mobile work system without authorization and stole customer information of approximately 6444 customers. The leaked data included names, phone numbers, email addresses, resident registration numbers, driver's licenses, account numbers, and copies of identification documents. The attack worked by exploiting the unauthorized access to the internal mobile work system for about an hour, starting from 11:28 am on October 27th. As a result, Naver Bug reported that the leaked personal information may be used for financial fraud, voice phishing, and impersonation of employees, prompting special attention. The current status is that Bithumb has taken emergency measures to block access routes and suspend system use after detecting abnormal access at 12:14 pm on October 27th, while Naver Bug promised to take responsibility for all confirmed damages and conduct necessary support and compensation procedures for affected customers.
Technical Mitigations AI-generated
• Block access to the internal mobile work system used by Bithumb employees without authorization. • Use encryption for sensitive data stored in the system, such as customer information and identification documents. • Implement a robust security audit and investigation process to detect abnormal access patterns and identify vulnerabilities.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
Target & Sectors
Global Scope financefinance
Incident Timeline
‎2026/10/29
Hackers stole 6444 customer information from Naver's Bithumb Exchange.
organisation Naver Bug
The Naver Bug report stated that "the leaked personal information may be used for financial fraud, voice phishing, and impersonation of Naver Bug employees, so we ask for special attention."
organisation Naver's Bithumb Exchange
Hackers Stole 6444 Customer Information from Naver's Bithumb Exchange According to Naver's Bithumb, customer information of 6444 customers was leaked from the exchange's internal mobile work system.
victims 6444 Customer Information
Hackers Stole 6444 Customer Information from Naver's Bithumb Exchange According to Naver's Bithumb, customer information of 6444 customers was leaked from the exchange's internal mobile work system.
On 29th, Bithumb announced on its website that 6444 customer information was leaked due to a hacking incident on its internal mobile work system that occurred on 27th.
Further investigation revealed that customer information was also leaked, leading to the report of 6444 customer information being leaked.
organisation The Financial Supervisory Commission
The Financial Supervisory Commission announced on the 14th of the previous month that there were 16 financial institutions affected by the incident, with a leaked personal information scale of around 100,000 cases.
organisation Miroo Life Insurance
Subsequently, Miroo Life Insurance, Daesung Securities, Miroo Asset Management, and Naver Bug were also confirmed to have been affected, increasing the total number of affected institutions to 20.
organisation Daesung Securities
Subsequently, Miroo Life Insurance, Daesung Securities, Miroo Asset Management, and Naver Bug were also confirmed to have been affected, increasing the total number of affected institutions to 20.
organisation Miroo Asset Management
Subsequently, Miroo Life Insurance, Daesung Securities, Miroo Asset Management, and Naver Bug were also confirmed to have been affected, increasing the total number of affected institutions to 20.
organisation KB Kookmin Bank
KB Kookmin Bank initially stated that the target of the leaked personal information was 119 people, but the results of a precise investigation revealed that it was actually 2,210 people.
victims 646 employee information
Bithumb initially confirmed that 646 employee information and 69 employee information from its partners were leaked, totaling 715 pieces of information.
victims 69 employee information
Bithumb initially confirmed that 646 employee information and 69 employee information from its partners were leaked, totaling 715 pieces of information.
Tactical Metrics
Metrics
victims
6,444
Customer Information
Hackers Stole 6444 Customer Information from Naver's Bithumb Exchange According to Naver's Bithumb, customer information of 6444 customers was leaked from the exchange's internal mobile work system.
On 29th, Bithumb announced on its website that 6444 customer information was leaked due to a hacking incident on its internal mobile work system that occurred on 27th.
Further investigation revealed that customer information was also leaked, leading to the report of 6444 customer information being leaked.
Metrics
victims
646
Employee Information
Bithumb initially confirmed that 646 employee information and 69 employee information from its partners were leaked, totaling 715 pieces of information.
Metrics
victims
69
Employee Information
Bithumb initially confirmed that 646 employee information and 69 employee information from its partners were leaked, totaling 715 pieces of information.
Intelligence Sources
Chosun Economy 2026-10-29