Investigating

Yokosuka City: Arcadia intrusion may have exposed disaster/crime-mail registrant data

Disclosed Oct 13, 2026. SpeeCAN RAIDEN-backed services may have exposed: disaster mail (47,065 emails), disaster FAX (996 name/phone/FAX/email), disaster phone (11 name/phone/FAX), Yokosuka crime-mail (10,848 emails). Final counts under investigation; subsets not summed.

Last updated: 2026-11-09

Overview

Subsets not summed → 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. 横須賀市防災情報メール及び防犯あんしんメール配信サービス等における不正アクセスに伴う個人情報の漏えいのおそれについて横須賀市 · 2026-11-09

Related information

arcadia-speecan-raiden-possible-leak-2026

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