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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
Chiba Pref.: Arcadia intrusion may have exposed staff-assembly system personnel data千葉県InvestigatingUnknown2026-10-14
Asahikawa City: Arcadia SpeeCAN RAIDEN intrusion may have exposed FAX numbers and emails旭川市InvestigatingUnknown2026-10-14
Kyotango City: Arcadia SpeeCAN RAIDEN intrusion may have exposed about 4,957 (gross) multi-mail registrations京丹後市InvestigatingUnknown2026-10-14
Ono City (Hyogo): Arcadia SpeeCAN RAIDEN intrusion may have exposed emergency-notification registrant data小野市InvestigatingUnknown2026-10-14
Imari City: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-notification registrant data伊万里市InvestigatingUnknown2026-10-14
Kizugawa City: Arcadia intrusion may have exposed disaster-info mail registrant data木津川市InvestigatingUnknown2026-10-14
Toyono Town: SpeeCAN RAIDEN intrusion may have exposed Tanpopo Mail registrant data豊能町InvestigatingUnknown2026-10-14
Mazda: Commune-hosted CLUB MAZDA COMMUNITY may have exposed data on up to 4,103 peopleマツダInvestigatingUnknown2026-10-14
Nagoya City: Arcadia intrusion may have exposed data on 557 Net119 registrants名古屋市Investigating557 People2026-10-14
Maebashi City: Arcadia intrusion may have exposed Hiro-mail and related registrant data前橋市InvestigatingUnknown2026-10-14
Hashima City: Arcadia 119 RAIDEN intrusion may have exposed 493 fire-mail registrations羽島市Investigating493 Records2026-10-14
Otsu City: vendor intrusion may have exposed disaster-mail registered emails大津市InvestigatingUnknown2026-10-14
Kakamigahara City: Arcadia intrusion may have exposed 119RAIDEN and NET119 registrant data各務原市InvestigatingUnknown2026-10-14
Hiroshima City: Arcadia intrusion may have exposed staff-assembly system personnel data広島市InvestigatingUnknown2026-10-14
Hino City: Arcadia intrusion may have exposed mail-delivery registrant names and emails日野市InvestigatingUnknown2026-10-14
Itako City: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-mail data for ward heads, welfare commissioners, fire corps and staff潮来市InvestigatingUnknown2026-10-14
Urasoe City: SpeeCAN RAIDEN intrusion may have exposed disaster flash-mail registrant data浦添市InvestigatingUnknown2026-10-14
Kitashiobara Village: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-radio-mail registrant data北塩原村InvestigatingUnknown2026-10-13
Yorii Town: vendor intrusion may have exposed data on 3,024 mail-delivery registrants寄居町Investigating3,024 People2026-10-13
Konan City (Shiga): Arcadia SpeeCAN RAIDEN intrusion may have exposed mail-delivery registrant data湖南市InvestigatingUnknown2026-10-13