2026 Arcadia — SpeeCAN RAIDEN unauthorized access; up to ~3.14M emails
Data compromised
Company maximum-possible exposure (not a confirmed take): ~3.136M email addresses, ~105k phone numbers, ~15k fax numbers, plus names/DOB/sex/address on some NET119/119RAIDEN cohorts (~13k on NET119). Message-history text on RAIDEN may be in scope. MIC: 110 local governments reported pause or possible leak by 14 Oct; ~875 governments used the service as of late September. recordsAffected 3136000 is the email ceiling.
Technical writeup
Verified Arcadia notice (13 Oct 2026 PDF) and RAIDEN status posts: suspicious access 11 Oct, path blocked 12 Oct, some services emergency-stopped 13 Oct. NHK/Kyodo 14 Oct: ~800 entities; Oita/Shizuoka/Shiga paused; MIC asked for a damage report. Figures are possible-leak maxima pending forensics. companyConfirmed true; recordsAffected 3136000 (email ceiling).
Root cause
Unauthorized access to SpeeCAN RAIDEN (detected 11 Oct 16:30 JST; path blocked ~12 Oct 03:00). Municipal disaster / NET119 / school-alert systems. Cause beyond third-party intrusion not specified.