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Large Data Breaches Hit Retail and Corporate Sectors in Japan and Korea

Large Data Breaches Hit Retail and Corporate Sectors in Japan and Korea

First seen 9 Nov 2026, 00:18 UTC • •
API

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ThreatCluster AI
ThreatCluster •November 9, 2026 at 00:18 UTC
  • •Over 3 million personal records leaked in Korea's retail sector due to API vulnerabilities.
  • •Japan reported 260 million personal records compromised, with a sharp rise in breaches in October.
  • •AI tools are being used to exploit vulnerabilities in corporate systems, affecting multiple companies.

In recent months, the retail sector in Korea has faced a series of personal data breaches, with over 3 million records compromised. SSG.com reported a breach on November 4, 2026, due to an API vulnerability, affecting customer names and IDs. Other companies like Gmarket and Halys have also reported similar incidents, with a total of approximately 3.83 million records leaked. Meanwhile, in Japan, around 260 million personal information records have been exposed since April 2026, with a significant surge in breaches reported in October. The Personal Information Protection Commission noted 2,094 incidents, with many attributed to AI-assisted hacking. The situation highlights vulnerabilities in both internal systems and third-party services, leading to increased security investments by affected companies.

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Timeline

2026-10-16
October breach statistics released
The Commission noted 830 unauthorized access cases in the first half of October, highlighting a growing trend in data breaches.
Nippon
2026-11-04
SSG.com reports data breach
An API vulnerability allowed unauthorized access to customer information, affecting SSG.com users.
Mt.Co.Kr
2026-11-06
Japan reports 260 million records leaked
The Personal Information Protection Commission revealed that 2,094 data breach incidents occurred since April, with a spike in October.
Nippon

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Common questions

How many records were leaked in Korea?
Over 3 million personal records have been compromised in the retail sector in Korea.
What caused the breaches in Japan?
Many breaches are attributed to AI-assisted hacking techniques exploiting corporate vulnerabilities.
What actions are companies taking in response?
Companies are increasing their security investments and establishing new information security centers.