arcadia-raiden-2026 · Disclosed 2026-10-13
SpeeCAN RAIDEN: unauthorized access affecting disaster and emergency messaging
Suspicious activity was detected on October 11. About 3.136 million disaster-messaging email addresses may be exposed; a follow-up also describes potential NET119 and 119RAIDEN impact.
Outcome: Confirmed breach
Entry path and evidence
- Reported fact
Suspicious activity was detected on October 11; emergency path blocking followed on October 12.
[s1]10月13日 状況のご報告・経緯 - Reported fact
Maximum estimated potential exposure includes about 3,136,000 email addresses, 105,000 phone numbers and 15,000 fax numbers. These are not person counts and must not be added.
[s1]10月13日 状況のご報告・最大件数 - Reported fact
Report 11 describes potential exposure of data tied to 9,020 NET119 email addresses and about 97,000 email, 17,000 phone and 400 fax entries at 119RAIDEN.
[s1]10月16日18時10分 第11報
Timeline
Reported response
- Reported fact
The vendor reported blocking intrusion paths and restoring suspended servers on October 15. NET119 and 119RAIDEN were described as having no planned suspension.
[s1]第9報 / 第11報 / 10月13日状況報告
Cause and mitigation hypotheses
Not assessed. Editorial hypotheses have not been added for this incident; this does not establish safety or a confirmed cause.
Evidence relevant to prevention
Insufficient evidence
The entry mechanism is undisclosed; avoidability cannot be assessed. Inspect exposure, privileges, logs and retained data using the linked rules.
Editorial assessment; not a determination of liability. [s1]
Unknowns and AI involvement
The reviewed disclosures do not establish attacker use of AI.
The entry mechanism, CVE, deduplicated person count and confirmed leakage scope are undisclosed. Related service/customer announcements are not counted as separate incidents.
Sources
[s1] アルカディア · Primary source
SpeeCAN RAIDENへの不正アクセスに伴う一連の対応について（第11報まで） ↗Published 2026-10-13 · Reviewed 2026-10-19
[s2] アルカディア · Primary source
SpeeCAN RAIDENへの不正アクセスに伴う一連の対応について ↗Published 2026-10-16 · Reviewed 2026-10-19