Investigating

Hiroshima Gas: investigating possible customer-data impact from Ryomo Systems intrusion

Possible data leak: Following Ryomo Systems’ internal-network intrusion (maintainer of Hiroshima Gas customer systems), the company posted on Sep 30, 2026 that customer-data leakage was not confirmed at that time and review continues. Related to the Ryomo incident.

Last updated: 2026-11-09

Overview

No confirmed count → blank.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

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

  1. システム維持管理事業者への不正アクセスに関するお知らせ広島ガス株式会社 · 2026-11-09

Related information

ryomo-systems-ransomware-intrusion-possible-leak-2026

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