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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
2rinkan confirms app API breach affecting 3,179,454 people株式会社２りんかんイエローハットConfirmed3,179,454 People2026-04-23
Tokyo Monorail: data of about 3,400 people may have leaked after loss of a desktop PC awaiting disposal東京モノレールInvestigatingUnknown2026-04-23
Mazda Hospital: data of 626 patients may have leaked after imaging contractor cloud misconfigurationマツダ病院Investigating626 People2026-04-23
Taisei Housy: customer data may have leaked via ielove CLOUD intrusionタイセイ・ハウジーInvestigatingUnknown2026-04-22
Takahata Town: data of 2,354 people in the paddy-conversion system may have leaked via YCC高畠町Investigating2,354 People2026-04-20
Clearth Rent: customer data may have leaked via ielove CLOUD intrusionクレアスレントInvestigatingUnknown2026-04-20
Oguni Town: 1,369 welfare-medical records may have leaked via YCC ransomware小国町Investigating1,369 Records2026-04-17
Nihon Zaitaku: customer data may have leaked via ielove CLOUD intrusion日本財託InvestigatingUnknown2026-04-17
Kaneyama Town: town clinic patient data may have leaked via YCC ransomware金山町InvestigatingUnknown2026-04-17
Rize Clinic: patient LINE data may have leaked after LINE-delivery-system intrusionリゼクリニックInvestigatingUnknown2026-04-17
Satte City: national-health data of 34,330 people may have leaked via subcontractor YCC幸手市Investigating34,330 People2026-04-17
Yamagata Prefecture: about 26,800 entrusted records may have been exposed via YCC ransomware山形県InvestigatingUnknown2026-04-17
Yamagata Kotsu: bus and taxi customer data may have leaked via YCC ransomware山形交通InvestigatingUnknown2026-04-17
Nippon Rent-A-Car: car-share member data may have leaked via Nippon Telenet ransomwareニッポンレンタカーInvestigatingUnknown2026-04-17
Yamako: 2,398 customer and staff records may have leaked via YCC ransomwareヤマコーInvestigating2,398 Records2026-04-17
Shonai Town: library and training-room users may have leaked via YCC ransomware庄内町InvestigatingUnknown2026-04-17
Jusnet reports possible data leak from employee Chatwork accountジャスネットコミュニケーションズ株式会社InvestigatingUnknown2026-04-16
Yokosuka City: data of 145 people and 12 firms leaked via misattached tax FP-consultation list横須賀市Confirmed145 People2026-04-16
Yamagata City: staff and resident data may have leaked via contractor YCC ransomware山形市InvestigatingUnknown2026-04-16
Cecile: customer data may have leaked via Nippon Telenet cyber-attack on fax-sending contractorセシールInvestigatingUnknown2026-04-16