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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
Unirita: Commune-hosted Oshigoto Kaikaku Labo may have exposed up to 1,169 members’ dataユニリタInvestigatingUnknown2026-10-13
Saitama City: Arcadia intrusion may have exposed disaster-notification registrant dataさいたま市InvestigatingUnknown2026-10-13
Nasukarasuyama City: Arcadia intrusion may have exposed 3,802 disaster/admin-mail registrations那須烏山市Investigating3,802 Records2026-10-13
Ride On Express HD: vendor ransomware may have exposed up to about 6.5M personal recordsライドオンエクスプレスホールディングスInvestigatingUnknown2026-10-13
Obihiro City: Arcadia SpeeCAN RAIDEN intrusion may have exposed emergency mass-notification registrant data帯広市InvestigatingUnknown2026-10-13
Minoh City: Arcadia SpeeCAN RAIDEN intrusion may have exposed citizen safety-mail registrant data箕面市InvestigatingUnknown2026-10-13
Fivot (IDARE): support-software vulnerability led to leak of 129,659 registrants’ dataFivotConfirmed129,659 People2026-10-13
Oita Pref.: emergency-mail system intrusion may have exposed 27,667 registrant emails大分県Investigating27,667 Records2026-10-13
Zama City: Arcadia SpeeCAN RAIDEN intrusion may have exposed Isama Mail and staff-assembly registrant data座間市InvestigatingUnknown2026-10-13
Nanto City: SpeeCAN RAIDEN intrusion may have exposed Nanto emergency-mail registrant data南砺市InvestigatingUnknown2026-10-13
Ayase City: Arcadia intrusion may have exposed data on 11,053 safety-mail registrants綾瀬市Investigating11,053 People2026-10-13
Tomiya City: Arcadia SpeeCAN RAIDEN intrusion may have exposed safety-mail emails富谷市InvestigatingUnknown2026-10-13
Joetsu City: Arcadia SpeeCAN RAIDEN intrusion may have exposed safety-mail registrant data上越市InvestigatingUnknown2026-10-13
Tokai City: Arcadia SpeeCAN RAIDEN intrusion may have exposed 1,210 disaster-notification records東海市Investigating1,210 Records2026-10-13
Oyabe City: SpeeCAN RAIDEN intrusion may have exposed disaster/emergency-mail registrant data小矢部市InvestigatingUnknown2026-10-13
Itoman City: Arcadia SpeeCAN RAIDEN intrusion may have exposed disaster-mail emails糸満市InvestigatingUnknown2026-10-13
Arcadia: SpeeCAN RAIDEN intrusion may have exposed up to about 3.136M contact emails and other dataアルカディアInvestigatingUnknown2026-10-13
Sabae City: Arcadia intrusion may have exposed emergency mass-mail registrant data鯖江市InvestigatingUnknown2026-10-13
Ikoma City: Arcadia intrusion may have exposed emergency/disaster-mail registrant data生駒市InvestigatingUnknown2026-10-13
Mybo Fellows: membership-system intrusion leaked data on 419 membersマイボフェローズConfirmed419 People2026-10-13