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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
Hakuhodo DY ONE: Commune-hosted DIGIFUL BASE may have exposed about 1,940 members’ dataHakuhodo DY ONEInvestigatingUnknown2026-10-14
Izumiotsu City: Arcadia intrusion may have exposed data on 783 phone/FAX disaster registrants and 941 staff-mail accounts泉大津市InvestigatingUnknown2026-10-14
Umi Town: Arcadia intrusion may have exposed disaster-mail registrant data宇美町InvestigatingUnknown2026-10-14
Ayabe City: 119RAIDEN vendor intrusion may have exposed email-dispatch registrant data綾部市InvestigatingUnknown2026-10-14
Matsue City: Arcadia NET119 intrusion may have exposed emergency-reporting registrant data松江市InvestigatingUnknown2026-10-14
Chita City: Arcadia intrusion may have exposed about 700 staff notification registrations知多市InvestigatingUnknown2026-10-14
Fukuyama City: Arcadia SpeeCAN RAIDEN intrusion may have exposed Fukuyama disaster-mail registrant data福山市InvestigatingUnknown2026-10-14
Akune Area Fire Union: vendor intrusion may have exposed NET119 and 119RAIDEN registrant data阿久根地区消防組合InvestigatingUnknown2026-10-14
Iwanuma City: Arcadia SpeeCAN RAIDEN intrusion may have exposed i-Ai Mail and vulnerable-facility mass-mail registrant data岩沼市InvestigatingUnknown2026-10-14
Togane City: vendor intrusion may have exposed disaster-mail registered emails東金市InvestigatingUnknown2026-10-14
Shizuoka City: Arcadia intrusion leaked disaster-mail registrant data (some services still possible)静岡市InvestigatingUnknown2026-10-14
Koriyama City: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-mail registered emails郡山市InvestigatingUnknown2026-10-14
Koga City (Fukuoka): Arcadia intrusion may have exposed 5,501 disaster-mail registrations古賀市Investigating5,501 Records2026-10-14
Takatsuki City: Arcadia SpeeCAN RAIDEN intrusion may have exposed emergency/disaster notification and related registrant data高槻市InvestigatingUnknown2026-10-14
Kanagawa Pref.: Arcadia SpeeCAN RAIDEN intrusion may have exposed air-pollution mail/phone registrant data神奈川県InvestigatingUnknown2026-10-14
Mitaka City: Arcadia SpeeCAN RAIDEN intrusion may have exposed emergency-delivery and staff-assembly registrant data三鷹市InvestigatingUnknown2026-10-14
Otofuke Town: SpeeCAN RAIDEN intrusion may have exposed disaster and missing-person notification registrant data音更町InvestigatingUnknown2026-10-14
Kitakyushu City: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-info delivery registrant data北九州市InvestigatingUnknown2026-10-14
Fukushima City: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-mail registrant data福島市InvestigatingUnknown2026-10-14
MIXI: Commune-hosted Kotoportal may have exposed 750 members’ dataMIXIInvestigating750 People2026-10-14