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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
Chikyosai: RIZAP generative-AI misuse may have exposed 726 members’ data地方職員共済組合Investigating726 People2026-09-04
Dokenpo: RIZAP generative-AI misuse may have exposed 1,167 members’ data全国土木建築国民健康保険組合Investigating1,167 People2026-09-03
RIZAP: mistaken upload of health-guidance data to a consumer generative-AI service may have exposed personal and sensitive health dataRIZAPInvestigatingUnknown2026-09-03
Seibu Railway: misconfiguration on “52 Seats of Bliss” booking site left reservation data externally readable西武鉄道ConfirmedUnknown2026-09-02
IHI Group kenpo: RIZAP generative-AI misuse may have exposed 210 members’ dataIHIグループ健康保険組合Investigating210 People2026-09-02
Chiba Pref.: biodiversity-center site intrusion may have exposed survey-member personal data千葉県InvestigatingUnknown2026-09-01
Mitsui Fudosan: credential misuse on used systems may have exposed staff and external-contact data三井不動産InvestigatingUnknown2026-09-01
TRUNK: staff mailbox intrusion leaked 424 people’s personal dataTRUNKConfirmed424 Records2026-09-01
Kwansei Gakuin University: adjunct-used external SNS hyocom left 1,448 students’ data viewable関西学院大学Confirmed1,448 People2026-09-01
Ando Hazama: employee tricked by fake police sent about 5,000 business-card records安藤ハザマConfirmedUnknown2026-08-31
Niigata City Yamagata JH: health and dental records for 387 students lost新潟市Confirmed387 People2026-08-31
Mandarake: server intrusion may have exposed mail-order customers’ shipping dataまんだらけInvestigatingUnknown2026-08-30
Yellow Hat: data of 1,797,124 members exfiltrated from web service-booking systemイエローハットConfirmed1,797,124 People2026-08-28
Corona: construction-info cloud intrusion may have exposed up to 35,000 customersコロナInvestigatingUnknown2026-08-28
MHLW: lost minimum-wage survey forms may have exposed personal data on 339 people (gross)厚生労働省Investigating339 People2026-08-28
Kindal: phishing takeover of an EC staff account leaked 136,464 customers’ dataカインドオルConfirmed136,464 People2026-08-28
Co-op Yamaguchi: LINE mini-app DB intrusion may have exposed member and related dataコープやまぐちInvestigatingUnknown2026-08-28
Zurich Japan: dashcam-upload system intrusion may have leaked data on up to 1,668 customersチューリッヒ保険InvestigatingUnknown2026-08-27
COO: Meruhaikun intrusion leaked 2,255 customer email addressesクーConfirmed2,255 Records2026-08-27
CINRA JOB: vulnerability-driven intrusion may have exposed 21,508 members’ dataCINRAInvestigating21,508 People2026-08-27