yakiniku-king-2026 · Disclosed 2026-10-05

Yakiniku King: leakage of 10,788,963 app-member records

Unauthorized member-system access leaked 10,788,963 records. The detailed cause and entry path remain under investigation.

Cause unresolved / undisclosed

Outcome: Confirmed breach

Entry path and evidence

Reported fact
Unauthorized access to the member-management system was detected on October 2.
[s1]1. 経緯
Reported fact
10,788,963 records with member numbers, names, emails, and phone numbers leaked; login passwords and store histories were unaffected.
[s1]2. 漏えいした情報の内容
Unknown
The cause and circumstances enabling entry remain under investigation.
[s1]3. 原因

2026-10-02
Unauthorized access detected; communications blocked and defensive measures applied. [s1]
2026-10-03
Member-data leakage confirmed. [s1]
2026-10-05
Leakage and response disclosed. [s1]

Reported fact
Communications were blocked and defenses applied; further security measures and authority reports are underway.
[s1]1. 経緯 / 4. 対策および今後の対応

Insufficient evidence

Inspect member-database exposure, administrative privileges, access logs, and retained attributes and deadlines.

Editorial assessment; not a determination of liability. [s1]

AI involvementUnknown

The reviewed disclosures do not establish attacker use of AI.

A library flaw, endpoint compromise, credential leak, or other specific cause is not established.