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First notice Oct 13, 2026. Arcadia-operated Ayase safety/security mail may have leaked personal data; 11,053 registered users. Service suspended.
Disclosed Oct 13, 2026. Arcadia SpeeCAN RAIDEN intrusion may have exposed Tomiya safety-mail registered emails. No headcount.
Disclosed Oct 13, 2026 (page also notes Oct 30 update). SpeeCAN RAIDEN intrusion may have exposed resident emails; fire-corps name/email/phone/unit/rank; and staff name/email/staff-ID/affiliation. Headcount under investigation.
Disclosed Oct 13, 2026. SpeeCAN RAIDEN intrusion may have exposed 1,210 registrations (1,000 city staff / 210 medical etc.). Published total 1,210 stored; breakdown in text.
Disclosed Oct 13, 2026. Disaster/emergency-mail SpeeCAN RAIDEN intrusion may have exposed registered emails and optionally registered names. No headcount. Delivery still operating normally.
Disclosed Oct 13, 2026. Arcadia reported SpeeCAN RAIDEN intrusion (Oct 11 16:30) and possible personal-data leak. Possible exposure: disaster-mail registered emails. Notice states city’s delivery was not in the emergency-stop set. No headcount.
First notice Oct 13, 2026 (ongoing updates). Suspicious activity Oct 11 16:30; path blocked ~03:00 Oct 12. SpeeCAN RAIDEN contact name/email/phone/FAX, staff, contract data and message history may have leaked. Estimated maxima: ~3,136,000 emails, ~105,000 phones, ~15,000 faxes. No payment data. Subcount “about” estimates not summed. Many municipality/enterprise victim notices followed.
Disclosed Oct 13, 2026 (resume note Oct 16). Arcadia operator intrusion may have exposed personal data. Delivery stopped Oct 13 and resumed Oct 16. Leak confirmation/scope still under investigation. No headcount.
Possible data leak: Disclosed Oct 13, 2026. About 3,000 resident emails, about 1,000 staff-assembly records and about 10 FAX records may all have leaked. Subsets not summed.
Unauthorised activity was identified August 28, 2026 and on August 30 files and folders were confirmed copied or downloaded.
Parent DCM Holdings disclosed Oct 13, 2026. Anomalous access Sep 21 confirmed as intrusion Oct 8; app fully stopped Oct 9. 419 members: member number, email, status, stage, points etc. Name/address/phone/DOB/password/cards not included. Headcount still being refined.
Disclosed Oct 13, 2026 (page updated Oct 19). May have exposed Koganei safety-mail emails; emergency phone/FAX name and phone/FAX; fire-corps emergency contacts name/phone/email. No headcount.
Disclosed around Oct 13, 2026. SpeeCAN RAIDEN (Arcadia) intrusion (detected Oct 11) may have exposed personal data. Notice states town delivery continued. No headcount.
First notice Oct 13, 2026. Vendor Arcadia announced possible personal-data leak after third-party intrusion. Second notice Oct 14 stopped new sign-ups and warned about suspicious mail. No headcount.
Restart notice (Oct 15, 2026) restates that SpeeCAN RAIDEN third-party intrusion may have exposed personal data; investigation continuing. No headcount. Lead lists first public date as Oct 13, 2026.
Service stopped from 11:00 Oct 13, 2026 (page later updated Nov 5). Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster/crime-prevention mail registrant personal data. No headcount.
Page updated Oct 15, 2026. Arcadia SpeeCAN RAIDEN intrusion may have exposed Izumi Mail etc. registrant personal data. No headcount. Lead lists first public date as Oct 13, 2026.
Disclosed Oct 13, 2026. Staff-mail delivery vendor intrusion may have exposed about 2,200 staff name/email records.
Disclosed Oct 13, 2026. Arcadia-operated disaster/crime-info mail (via NEC Networks & System Integration) may have exposed 38,959 registrant emails etc.
Disclosed Oct 13, 2026 (page updated Nov 9). Arcadia SpeeCAN RAIDEN intrusion may have exposed registered emails. No headcount.