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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
Bank of Yokohama: card-loan and free-loan customer data leaked via SMBC Consumer Finance guarantee breach横浜銀行ConfirmedUnknown2026-11-05
Gakken: group customer personal data leaked via Arara email-delivery contractor breach学研ホールディングスConfirmedUnknown2026-11-05
Tsukuba Bank: customer data leaked via SMBC Consumer Finance card-loan guarantee breach筑波銀行ConfirmedUnknown2026-11-05
Customer data exposed at DOCOMO Online Shop and My docomo株式会社NTTドコモConfirmedUnknown2026-11-05
SMBC Consumer Finance: customer data sent out of guarantee-business system (up to 320,118 people)SMBCコンシューマーファイナンスConfirmedUnknown2026-11-05
GMO Payment Service: customer data leaked via Arara service used by its law-firm contractor (up to 106,997)GMOペイメントサービスConfirmedUnknown2026-11-05
Ogaki Kyoritsu Bank: card-loan applicant data leaked via SMBC Consumer Finance partner breach大垣共立銀行ConfirmedUnknown2026-11-05
Euglena: akyrise cosmetics e-commerce member data leaked after unauthorised accessユーグレナConfirmedUnknown2026-11-05
Ehime Bank: customer data leaked via SMBC Consumer Finance card-loan guarantee breach愛媛銀行ConfirmedUnknown2026-11-05
AIRDO: email addresses leaked via external email-delivery system breach (up to 673,920)AIRDOConfirmedUnknown2026-11-05
Kakaku.com: about 5.7 million email addresses from Tabelog, Kakaku.com and other services leaked via Arara breachカカクコム, アララ株式会社ConfirmedUnknown2026-11-05
NTT Townpage: 142,126 newsletter email addresses leaked via Arara repicaNTTタウンページConfirmed142,126 Records2026-11-05
Asahi Mutual Life: about 19,000 email addresses leaked via Arara email system used by a contractor朝日生命, アララ株式会社ConfirmedUnknown2026-11-05
Yokote City: landowner personal data may have leaked after ransomware attack on survey contractor横手市InvestigatingUnknown2026-11-05
Nissan Financial Services: customer data may have leaked via PCS road-service system breach (up to about 236,000)日産フィナンシャルサービスInvestigatingUnknown2026-11-05
Eight Dentsu inquiry records potentially exposed via Studio株式会社電通Investigating8 Records2026-11-05
Sumitomo Realty: 205,208 inquiry email addresses leaked via Arara service used by contractor住友不動産Confirmed205,208 Records2026-11-04
Nomura IR Kikan Navi breach exposes investor and analyst information野村インベスター・リレーションズ株式会社ConfirmedUnknown2026-11-04
Duskin DDuet: 657,886 member email addresses leaked via Arara breachダスキン, アララ株式会社Confirmed657,886 Records2026-11-04
Solaseed Air: about 490,000 customer email addresses leaked via external email-system breachソラシドエアConfirmedUnknown2026-11-04