Investigating

Nagano City: Arcadia intrusion may have exposed emails of 6,468 disaster-mail registrants

Disclosed Oct 14, 2026 (PDF body read). Arcadia-operated Nagano disaster mail may have exposed emails for 6,468 registered users (as of Oct 13). Delivery continued.

Last updated: 2026-11-09

Overview

6,468 people.

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. 「長野市防災メール」運営会社への不正アクセス事案長野市 · 2026-11-09

Related information

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