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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
JIHS: lost cardiac-exam HDD left data on 83,007 patients unaccounted for国立健康危機管理研究機構Confirmed83,007 People2026-07-31
Hacobu: lost MOVO Berth tablets may have allowed viewing of up to 50,384 driver recordsHacobuInvestigatingUnknown2026-07-30
Shin-Sapporo Howakai Hospital: old EHR PC HDD not destroyed and sold via auction, leaking patient data新札幌豊和会病院ConfirmedUnknown2026-07-30
Hareruya2: lottery misconfiguration left 28,490 applicants’ personal data publicly viewable晴れる屋Confirmed28,490 Records2026-07-30
Matsuyama City: training notice to 125 new farmers sent via To instead of Bcc松山市Confirmed125 People2026-07-29
Suginami City: survey mail labels wrongly printed nationality for 121 foreign residents杉並区Confirmed121 People2026-07-29
Life Insurance Association: guest-permission flaw left 27,407 inquiry-system users viewable生命保険協会Confirmed27,407 Records2026-07-29
Meitetsu Kyosho: customer data may have leaked after server intrusion名鉄協商InvestigatingUnknown2026-07-28
Chuden Fudosan: monthly-parking customer data may have leaked via Meitetsu Kyosho vendor attack中電不動産InvestigatingUnknown2026-07-28
Takara Tomy: Duel Masters support-app auth flaw may have allowed viewing of customer dataタカラトミーInvestigatingUnknown2026-07-28
Tokai Village Social Welfare Council: camp web-form misconfiguration exposed co-venue applicants東海村社会福祉協議会Confirmed145 People2026-07-28
Fine Co.: EC-site tampering may have leaked card data for 912 card-paying customersファインInvestigating912 Records2026-07-27
Anamizu Town: missing USB with health-checkup target data may have leaked personal information穴水町InvestigatingUnknown2026-07-27
Ishikawa Prefecture: mis-emailed all-8-towns child-support files covering 824 recipients石川県Confirmed824 People2026-07-27
CMIC HCI: intrusion into RA Connect public-area files leaked patient and physician dataシミックヘルスケア・インスティテュートConfirmedUnknown2026-07-24
OCS: FAMILY LINK SERVICE intrusion leaked user and admin account dataOCSConfirmedUnknown2026-07-24
Asahi Kasei Therapeutics: RA Connect vendor breach leaked patient, physician and staff data旭化成セラピューティクスConfirmedUnknown2026-07-24
Nidek: website vulnerability may have exposed member and inquiry dataニデックInvestigatingUnknown2026-07-24
Yanagawa City: regional farm-plan PDF exposed names of 3,828 farm operators柳川市Confirmed3,828 People2026-07-23
Mie Prefecture: Hisai Nofurin HS open-school form misconfiguration let 229 applicants see each other三重県Confirmed229 People2026-07-22