アルカディア(SpeeCAN RAIDEN / NET119)Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- October 13, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 3,136,000 records
- Main impact
- Municipal disaster email distribution and the emergency reporting app for the hearing- and speech-impaired "NET119" were suspended, and there is a possibility that up to 約313万6千件 email addresses were leaked. Detailed information for about 約1.3万件 NET119 registrants, including names, dates of birth, and addresses, was affected.
- Information involved
- Email addressPhone numberHome addressFull nameDate of birth
- Cause / key point
- Unauthorized third-party access to the disaster information distribution platform "SpeeCAN RAIDEN" (services suspended from 10月13日11時).
- Industry
- IT & telecom
- Listing / capital
- Unlisted
- Sources
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
Written & reviewed
Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.
CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.
Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:
Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction
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Incidents related to "アルカディア"
Incidents where the damage spread through the same service or system.
- B栃木県警（アルカディア利用内部システム）2026.10.20 announced・Affected 3,900 people
- B埼玉県警（アルカディア安否確認システム）2026.10.18 announced・Affected 13,000 people
- B伊万里・有田消防本部（NET119緊急通報システム）2026.10.15 announced・Affected 15 people
- B和歌山県立21校（ライデン・スクール）2026.10.15 announced・Affected 10,006 people
- A一宮市（アルカディア提供のメール配信・Net119等）2026.10.14 announced・Affected Unknown
- A斑鳩町（防災情報メール・ハザードン）2026.10.13 announced・Affected Unknown
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Incidents where the damage spread through the same service or system.
Same attack method
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Same industry
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- SSIDCフロンティア（IDCFクラウド）2026.10.07 announced・Affected 48 records
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- SSHelpfeel（Gyazo）2026.09.16 announced・Affected 23,620,000 records
- SPingCAP2026.10.21 announced・Affected 50,000 people
Attack method classification: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)
Read the Unauthorized access (method undisclosed) guide and national trends →