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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
Aichi Prefecture: contractor mis-sent 151 seminar applicants’ email addresses愛知県Confirmed151 People2026-03-11
Saison Fundex: leaseback customer data may have leaked via contractor Aoyama Main Kikaku ransomwareセゾンファンデックスInvestigatingUnknown2026-03-10
Yamagata University: faculty ages left undeleted on website documents, 2,149 entries (with duplicates)山形大学Confirmed2,149 Records2026-03-10
INPIT: contractor Shiga Invention Association mis-sent expert and external-director personal dataINPITConfirmedUnknown2026-03-06
White Essence Meguly: registrant personal data may have leaked after site intrusionホワイトエッセンスInvestigatingUnknown2026-03-06
Marimo Holdings: group employee data leaked after officer-impersonation phishingマリモホールディングスConfirmedUnknown2026-03-06
Nihon University Sangenjaya: staff mailbox personal data may have been viewed after phishing takeover日本大学InvestigatingUnknown2026-03-06
Tokyu Sekkei: third parties may have viewed related personal data after improper device use on public transport東急設計コンサルタントInvestigatingUnknown2026-03-03
AMED: 459 email addresses (279 personally identifiable) leaked via misaddressed bulk mailAMEDConfirmed459 Records2026-03-03
Kanehara Rinken Kokushi Online: 160 registrants’ emails and nicknames may have been publicly reachable金原出版Investigating160 Records2026-03-03
Jiho group reports possible exposure of up to 890 email addresses株式会社じほうInvestigatingUnknown2026-02-26
FABRIC TOKYO: other customers’ data may have been shown due to EC settings errorFABRIC TOKYOInvestigatingUnknown2026-02-19
JR Sendai Hospital: patient data of 11,791 people may have leaked after device lossesJR仙台病院Investigating11,791 People2026-02-18
JOGMEC: names of 2,246 mining-right holders leaked after ex-staff removal of dataJOGMECConfirmed2,246 People2026-02-17
Miyazaki Prefecture: personal data of 102 people may have leaked after accounting documents went missing宮崎県Investigating102 People2026-02-16
Hokuto City: 586 Hokuto Fan Club member emails leaked via misaddressed mail北杜市Confirmed586 People2026-02-14
Komae City: voter-roll data of 69,244 people may have leaked after election SD-card loss狛江市Investigating69,244 People2026-02-13
Sekaimon reports possible leak of member and business-related information株式会社ショップエアラインInvestigatingUnknown2026-02-13
GALA Yuzawa: customer data of up to 1,518 people may have leaked after server ransomwareガーラ湯沢InvestigatingUnknown2026-02-12
Mynavi: user, partner and employee data may have leaked via cloud-service intrusionマイナビInvestigatingUnknown2026-02-12