SignalAtlas
Share a reportManage my posts

Japan: Data Breach Incidents by Country / region

Search incidents by company, country, industry, year and attack method. Review affected data, impact, verification status, company responses and sources.

Country / region: JapanReset
767 results
CardsTable
Title / subjectOrganizationsVerificationReported impactDisclosed
Nagaokakyo City: Arcadia intrusion may have exposed disaster / missing-person / after-school / nursery / fire-corps / staff-assembly registrant data長岡京市InvestigatingUnknown2026-10-14
Isahaya City: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-mail registrant data諫早市InvestigatingUnknown2026-10-14
Nakama City: Arcadia RAIDEN/NET119 intrusion may have exposed multiple service registrant data中間市InvestigatingUnknown2026-10-14
Oita City: Arcadia intrusion may have exposed disaster-mail and related registrant data大分市InvestigatingUnknown2026-10-14
Ebetsu City: Arcadia intrusion may have exposed disaster-info service registrant data江別市InvestigatingUnknown2026-10-14
Yokohama City: vendor intrusion may have exposed about 2,024 notification registrants across eight wards横浜市InvestigatingUnknown2026-10-14
Izumisano City: Arcadia SpeeCAN RAIDEN intrusion may have exposed registration-mail and FAX registrant data泉佐野市InvestigatingUnknown2026-10-14
Suzuka City: Arcadia intrusion may have exposed disaster-mail and former Melmoni registered emails鈴鹿市InvestigatingUnknown2026-10-14
Takeo City: Arcadia intrusion may have exposed disaster mail/FAX/phone registrant data武雄市InvestigatingUnknown2026-10-14
Fujisawa City: Arcadia SpeeCAN RAIDEN / 119RAIDEN intrusion may have exposed Fujisawa mail-magazine and fire-alert registrant data藤沢市InvestigatingUnknown2026-10-14
Uenohara City: vendor intrusion may have exposed admin-disaster mail, phone/FAX, disaster-mail 119 and NET119 registrant data上野原市InvestigatingUnknown2026-10-14
Takasaki City: Arcadia intrusion may have exposed disaster phone/FAX registrant data高崎市InvestigatingUnknown2026-10-14
Shimane Pref.: Arcadia intrusion may have exposed about 1,500 road-regulation mail registrations島根県InvestigatingUnknown2026-10-14
Fujisaki Town: Arcadia intrusion may have exposed emails of 366 registration-mail users藤崎町Investigating366 People2026-10-14
Yuzawa Town: vendor intrusion may have exposed emails of 797 emergency-mail registrants and staff names湯沢町Investigating797 People2026-10-14
Nagano City: Arcadia intrusion may have exposed emails of 6,468 disaster-mail registrants長野市Investigating6,468 People2026-10-14
Naie Town: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster mass-notification registrant data奈井江町InvestigatingUnknown2026-10-14
Niigata City: disaster-notification vendor intrusion may have exposed Niigata disaster-mail and related data新潟市InvestigatingUnknown2026-10-14
Naka Town (Tokushima): Arcadia intrusion may have exposed data on 165 mimamori-network registrants and related contacts那賀町InvestigatingUnknown2026-10-14
Hayama Town: Arcadia intrusion may have exposed data on 8,850 disaster-mail registrants葉山町Investigating8,850 People2026-10-14