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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
Fukuoka Pref.: Arcadia SpeeCAN RAIDEN intrusion may have exposed landslide-risk notification registrant data福岡県InvestigatingUnknown2026-10-15
Mizunami City: Arcadia intrusion may have exposed data on 11 NET119 registrants瑞浪市Investigating11 People2026-10-15
Kitahiroshima Town: vendor intrusion may have exposed fire-notification registrant data北広島町InvestigatingUnknown2026-10-15
Hidaka Chubu Fire Union: vendor intrusion may have exposed notification registrant data日高中部消防組合InvestigatingUnknown2026-10-15
Minami-Alps City: Arcadia intrusion may have exposed NET119 registrant data南アルプス市InvestigatingUnknown2026-10-15
Ojiya City: SpeeCAN RAIDEN intrusion may have exposed emergency-mail registrant data小千谷市InvestigatingUnknown2026-10-15
Odawara City: Arcadia intrusion may have exposed disaster-mail and related registrant data小田原市InvestigatingUnknown2026-10-15
Yamaguchi City: Arcadia intrusion may have exposed NET119 registrant data山口市InvestigatingUnknown2026-10-14
Kobe City: Arcadia intrusion may have exposed staff-messaging data for about 13,000 people神戸市InvestigatingUnknown2026-10-14
Toyooka City: SpeeCAN RAIDEN intrusion may have exposed after-school and preschool emergency-mail registrant data豊岡市InvestigatingUnknown2026-10-14
Shibushi City: Arcadia intrusion may have exposed safety-mail registrant data志布志市InvestigatingUnknown2026-10-14
Kawanishi Town (Yamagata): Arcadia intrusion may have exposed 524 registration-mail / phone-FAX / staff-assembly records川西町Investigating524 Records2026-10-14
Fuchu City (Tokyo): 119RAIDEN intrusion may have exposed fire-corps, city-staff and fire-station mail registrations府中市InvestigatingUnknown2026-10-14
Kyoto City: disaster mass-notification vendor intrusion may have exposed personal data京都市InvestigatingUnknown2026-10-14
Yamanashi Pref.: vendor intrusion may have exposed about 900 staff emergency-assembly mail records山梨県InvestigatingUnknown2026-10-14
Yawatahama City: Arcadia intrusion may have exposed fire-corps contact-mail registrant data八幡浜市InvestigatingUnknown2026-10-14
Izumo City: Arcadia intrusion may have exposed Izumo disaster-mail registered emails出雲市InvestigatingUnknown2026-10-14
Makurazaki City: Arcadia intrusion may have exposed about 2,900 disaster/general-info mail registrations枕崎市InvestigatingUnknown2026-10-14
Aena: EC-app intrusion may have exposed mypage data for up to 817,215 membersアエナInvestigatingUnknown2026-10-14
Tachikawa City: Arcadia SpeeCAN RAIDEN intrusion may have exposed Tachikawa Mimamori Mail registrant data立川市InvestigatingUnknown2026-10-14