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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
Tsunagu: corporate-site intrusion may have exposed 157 contact-form submissions繋Investigating157 Records2026-08-27
Nippon Steel Kowa Real Estate: cloud intrusion may have exposed condo-sales customer data日鉄興和不動産InvestigatingUnknown2026-08-26
Nihon University Law: phishing takeover of a staff mailbox may have exposed stored personal data日本大学InvestigatingUnknown2026-08-25
COVER: Hololive OCG site CMS intrusion may have exposed inquiry-form personal dataカバーInvestigatingUnknown2026-08-25
Rakko: misuse of a Stripe live API key may have exposed payment-related data for 100 customersラッコInvestigating100 People2026-08-25
MSC: website intrusion may have exposed 297 form users’ personal dataマネジメントサービスセンターInvestigating297 People2026-08-25
Ramrock: Mimamori CUBE EC-site intrusion may have exposed personal dataラムロックInvestigatingUnknown2026-08-25
Yokohama Waterworks: 219 people’s returned exemption-cancellation notices went missing横浜市Confirmed219 People2026-08-24
ANA Trading: e-GIFT platform intrusion may have leaked corporate-contact personal data全日空商事InvestigatingUnknown2026-08-24
Fancrew: credential-stuffing logins may have exposed 59,389 members’ profile dataファンくるInvestigating59,389 People2026-08-24
Ehime Pref.: open-data food-permit file wrongly posted applicants’ home addresses and phones愛媛県ConfirmedUnknown2026-08-21
IMADEYA: stolen Shopify Admin API token used to exfiltrate order/customer dataいまでやConfirmedUnknown2026-08-21
NE Chemcat: internal-system intrusion may have leaked staff and related personal dataエヌ・イー ケムキャットInvestigatingUnknown2026-08-20
Okawa City: hidden Excel sheet may have exposed 188 past welfare commissioners’ names/phones大川市Investigating188 People2026-08-20
Elitz: cloud ACL gap on tenant-application email archives may have exposed personal dataエリッツInvestigatingUnknown2026-08-20
Expo 2025 Association: subcontractor Microsoft 365 intrusion may have exposed staff/performer data2025年日本国際博覧会協会InvestigatingUnknown2026-08-20
Anicom Sompo: Meruhaikun intrusion may have leaked 14,330 lost-pet search supporters’ dataアニコム損保Investigating14,330 Records2026-08-20
COTA: cyberattack may have allowed viewing of staff, partner, shareholder and customer dataコタInvestigatingUnknown2026-08-20
Shizuoka Pref.: Google Form misconfiguration let applicants view 109 peers’ personal data静岡県Confirmed109 People2026-08-19
GEX: ransomware incident may have allowed viewing of inquiry-customer personal dataジェックスInvestigatingUnknown2026-08-19