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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
Mikawa Town: data of 1,974 older residents may have leaked via contractor YCC Information Systems ransomware三川町Investigating1,974 People2026-04-15
STARTDASH: account data of 39,267 users across Kyuun and 11 apps may have leakedSTARTDASHInvestigating39,267 People2026-04-14
CAMPFIRE: data of 225,846 unique users may have leaked after GitHub-origin intrusionCAMPFIREInvestigating225,846 People2026-04-14
Shin FA Com: partner-employee personal data may have been viewed or taken after network intrusion新エフエイコムInvestigatingUnknown2026-04-14
Mobility Platform: MaaS Car member data may have leaked via Nippon Telenet ransomware at a subcontractorモビリティプラットフォームInvestigatingUnknown2026-04-14
Nambu: welfare-equipment customer data may have leaked via contractor Higashiyama ransomwareナンブInvestigatingUnknown2026-04-13
UPR: car-share member data may have leaked via subcontractor Nippon Telenet ransomwareユーピーアールInvestigatingUnknown2026-04-13
Omikenshi: employee personal data may have been exfiltrated after ransomwareオーミケンシInvestigatingUnknown2026-04-13
Saga Prefecture Airport Division: 108 travel-agency contact emails leaked via misaddressed mail佐賀県Confirmed108 People2026-04-10
NYK discloses data copying from fuel-procurement system日本郵船株式会社ConfirmedUnknown2026-04-09
Kanko Shop Morioka: 533 customer emails leaked via misaddressed bulk mailカンコーショップ盛岡Confirmed533 People2026-04-09
ielove GROUP: related-party data may have been taken after cloud-service intrusionいえらぶGROUPInvestigatingUnknown2026-04-08
Kumamoto City: personal data of 220 people leaked after loss of children’s counseling reservation book熊本市Confirmed220 People2026-04-08
Murata Manufacturing: employee and partner personal data may have been taken after IT-environment intrusion村田製作所InvestigatingUnknown2026-04-06
Resonus Face Clinic Tokyo: personal data of 369 patients taken after ransomwareリゾナスフェイスクリニック東京Confirmed369 People2026-04-06
YCC Information Systems: entrusted partner data may have leaked after file-server ransomwareYCC情報システムInvestigatingUnknown2026-04-03
Tokyu Resorts & Stay: guest data of 95,986 people leaked via misaddressed mail東急リゾーツ&ステイConfirmed95,986 People2026-04-03
GMO Aozora Net Bank: 1,820 customer records leaked via contractor SocioFuture file sent to another bankGMOあおぞらネット銀行Confirmed1,820 Records2026-04-03
Awa Bank: 27,745 customer-related records (with duplicates) leaked from OA test environment阿波銀行Confirmed27,745 Records2026-04-03
Fukuoka Bank: insurance-contract data of 1,052 individuals leaked via MetLife-seconded staff福岡銀行Confirmed1,052 People2026-03-27