Investigating

Co-op Yamaguchi: LINE mini-app DB intrusion may have exposed member and related data

Possible data leak: Unauthorized access to the Co-op Yamaguchi LINE mini-app disclosed Aug 28, 2026. Second report listed several category counts (members with/without e-money cards, reservation users, etc.). Cards, bank accounts, passwords and sensitive personal data out of scope.

Last updated: 2026-11-09

Overview

Category counts (e.g. 69,586 and 143,126) are subsets and are not summed → count blank.

Timeline

UnknownOccurred
UnknownDiscovered
2026-08-28Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

コープやまぐちLINEミニアプリへの不正アクセスによる個人情報漏えいのおそれについて（第一報）生活協同組合コープやまぐち · 2026-11-09
コープやまぐちLINEミニアプリへの不正アクセスによる個人情報漏えいのおそれについて（第二報）生活協同組合コープやまぐち · 2026-11-09

Co-op Yamaguchi: LINE mini-app DB intrusion may have exposed member and related data

Overview

Timeline

Organization response

What you can do

Sources

Related information

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