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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
Fuso Dentsu: credential misuse on a cloud share may have leaked 26,489 partner contact records扶桑電通Investigating26,489 Records2026-07-22
Nagoya Medical Center: staff personal USB with data on 591 patients temporarily lost名古屋医療センターConfirmed591 People2026-07-17
Kumamoto City: mis-attached nursery-fee file leaked personal data of 344 enrolled children熊本市Confirmed344 People2026-07-16
Shojin Alumni: 1,187 members’ names/emails may have leaked via Meruhaikun精進同窓会Investigating1,187 People2026-07-16
C-Connect Ink Revolution: payment-app tampering may have leaked 24,166 customer/card recordsシー・コネクトInvestigating24,166 Records2026-07-15
OMIC: auditor PC support scam may have leaked 924 customer names and other fields海外貨物検査Investigating924 Records2026-07-14
Media4u: SMS console account list of 95,412 rows leaked; 22,928 may contain personal dataメディア4uConfirmed22,928 Records2026-07-14
K9 Natural Japan: online-shop intrusion leaked 78,763 member recordsK9ナチュラルジャパンConfirmed78,763 Records2026-07-14
Five Foxes: member, inquiry and employee data may have leaked after ransomware incidentファイブフォックスInvestigatingUnknown2026-07-14
Nichirei Group: cyberattack confirmed to have leaked delivery, partner and employee personal dataニチレイConfirmedUnknown2026-07-13
Hachioji Gakuen: ransomware attack may have exposed current/former students’ and related personal data八王子学園InvestigatingUnknown2026-07-13
Lind Sports: 3,075 customer records may have leaked via former fax vendor Nippon TeleNet attackリンドスポーツInvestigating3,075 Records2026-07-13
Osaka Prefecture: Kogei HS lost a CD with ID photos of 703 students大阪府Confirmed703 People2026-07-10
Fukuoka University: student data may have leaked via vendor SMART SPI server compromise福岡大学InvestigatingUnknown2026-07-09
Network Japan: moving-customer DB intrusion may have destroyed/exfiltrated customer dataネットワークジャパンInvestigatingUnknown2026-07-09
Weleda Japan: personal data may have leaked after official online-shop intrusionヴェレダ・ジャパンInvestigatingUnknown2026-07-08
Toyota (GAZOO Racing): GR Yaris lottery waitlist details mis-emailed to other applicantsトヨタ自動車ConfirmedUnknown2026-07-08
Kyorin University: student/faculty/society data may have leaked after faculty PC support scam杏林大学InvestigatingUnknown2026-07-08
ORIX Life: mis-emailed files exposed personal data in 6,316 customer-opinion records to three agenciesオリックス生命Confirmed6,316 People2026-07-07
Prudential Life: ex-agent took customer forms for 1,570 people and lost them after leavingプルデンシャル生命Confirmed1,570 People2026-07-07