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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
Zetton’s forty three reports possible leak of 18,553 personal-data records株式会社ゼットンInvestigating18,553 Records2026-03-27
Joyfull: data of 23,585 employees/applicants and relatives may have leaked via contractor Zynas cyber-attackジョイフルInvestigating23,585 People2026-03-26
MoonStar: server intrusion may have exposed online-store customer data for up to about 593,000 peopleムーンスターInvestigatingUnknown2026-03-26
Sato Kogyo: worker and emergency-contact data may have been viewed after jobsite NAS intrusion佐藤工業InvestigatingUnknown2026-03-26
Niigata University Hospital: endocrine/metabolic patient data may have leaked after USB loss新潟大学医歯学総合病院InvestigatingUnknown2026-03-25
Osaka Marathon Organising Committee: volunteer system auth disabled, exposing 4,101 registrants大阪マラソン組織委員会Confirmed4,101 People2026-03-25
Niigata University: student/guarantor roster of 1,478 people misattached to degree-check mail新潟大学Confirmed1,478 People2026-03-24
Fukushima University: faculty ages left reachable on the web via installation-plan reports福島大学ConfirmedUnknown2026-03-24
NICT: voice files of 115 speakers leaked via mispublished speech corpusNICTConfirmed115 People2026-03-19
Mazda: 692 employee/partner records may have leaked after parts-warehouse system intrusionマツダInvestigating692 Records2026-03-19
Hotel Nikko Princess Kyoto: Expedia admin-account abuse may have exposed guest data and triggered fake payment messagesホテルプリンセス京都InvestigatingUnknown2026-03-19
Sekibunkan: 320 customer emails leaked via misaddressed textbook-sales mail積文館書店Confirmed320 People2026-03-19
NHK: 32,940 information-system registrant emails leaked via misaddressed mailNHKConfirmed32,940 People2026-03-18
International Budo University: personal data of about 120 graduates leaked via IT contractor intrusion国際武道大学ConfirmedUnknown2026-03-18
Tane General Hospital: surgical-patient data of 379 people may have leaked after contractor USB loss多根総合病院Investigating379 People2026-03-17
Medica Publishing: customer and related personal data may have leaked after ransomwareメディカ出版InvestigatingUnknown2026-03-17
Nippon Telenet: entrusted and customer personal data may have leaked after ransomware日本テレネットInvestigatingUnknown2026-03-17
United Arrows: partner-list personal data of about 10,000 people leaked after ex-employee removalユナイテッドアローズConfirmedUnknown2026-03-16
Chukai TV: names and addresses may have leaked via misaddressed campaign direct mail中海テレビ放送InvestigatingUnknown2026-03-13
Urasoe City: data of about 9,100 students and guardians may have leaked after contractor HDD loss at Minatogawa JHS浦添市InvestigatingUnknown2026-03-13