Investigating

Koga City (Fukuoka): Arcadia intrusion may have exposed 5,501 disaster-mail registrations

Disclosed Oct 14, 2026. Per Arcadia report on the disaster-notification system, 5,501 registrations (registered name/email/phone/FAX) may have leaked. New sign-ups/changes stopped; alert delivery continued.

Last updated: 2026-11-09

Overview

5,501 records.

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. 防災情報配信システムへの不正アクセスによる個人情報漏洩の可能性および注意喚起について古賀市 · 2026-11-09

Related information

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