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daiki-suisan-2026 · Disclosed 2026-10-05

大起水産: unauthorized access and impact

Unauthorized app-system access was detected on September 15; the specific mechanism is undisclosed. Potential exposure covers 174,933 registered users. Passwords were held on a separate server and were unaffected.

Cause unresolved / undisclosed

Outcome: Confirmed breach

Entry path and evidence

  • Reported fact

    Unauthorized app-system access was detected on September 15; the specific mechanism is undisclosed.

    [s1]p.1 §1 / p.2 §2
  • Reported fact

    Potential exposure covers 174,933 registered users. Passwords were held on a separate server and were unaffected.

    [s1]p.1 §1 / p.2 §2

Timeline

  1. Disclosure date established by the reviewed notice. [s1]

Reported response

  • Reported fact

    Access controls and monitoring were strengthened; external specialists are investigating.

    [s1]p.1 §1 / p.2 §2

Cause and mitigation hypotheses

Not assessed. Editorial hypotheses have not been added for this incident; this does not establish safety or a confirmed cause.

Evidence relevant to prevention

Insufficient evidence

Undisclosed entry or patch timing prevents an avoidability assessment. Inspect privileges, retrieval logs, retention and deployed configuration using the linked rules.

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

Unknowns and AI involvement

AI involvementUnknown

The reviewed disclosures do not establish attacker use of AI.

Confirmed exfiltration scope and the technical cause are undisclosed.

Sources

  1. [s1] 大起水産 · Primary source

    大起水産：事故に関する公表資料 ↗

    Reviewed 2026-10-09