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jogmec-directory-2026 · Disclosed 2026-10-02

JOGMEC: unauthorized access and impact

Investigation found possible leakage through unauthorized system access on September 9. Potential scope covers about 1,100 staff and 7,400 external email addresses.

Cause unresolved / undisclosed

Outcome: Confirmed breach

Entry path and evidence

  • Reported fact

    Investigation found possible leakage through unauthorized system access on September 9.

    [s1]§§1-5
  • Reported fact

    Potential scope covers about 1,100 staff and 7,400 external email addresses.

    [s1]§§1-5

Timeline

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

Reported response

  • Reported fact

    Access and traffic controls were applied and authentication and monitoring strengthened.

    [s1]§§1-5

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.

The initial entry mechanism and actual exfiltration scope are undisclosed; internal and external contact counts are separate.

Sources

  1. [s1] JOGMEC · Primary source

    JOGMEC：事故に関する公表資料 ↗

    Reviewed 2026-10-09