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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
Fuji Yakuhin: Sagawa parcel-inquiry intrusion may have exposed mail-order customer data富士薬品InvestigatingUnknown2026-10-08
Hotelier: PMS intrusion leaked guest data on 7,919 people across 8 propertiesホテリエConfirmed7,919 People2026-10-07
Point Income: intrusion may have exposed personal data in 195 member/employee accountsセレスInvestigating195 Records2026-10-07
Toda Corporation: supplier and employee data leaked via payment-system intrusion戸田建設ConfirmedUnknown2026-10-07
HIS: passport data may have leaked after intrusion into Thailand subsidiary file serverエイチ・アイ・エスInvestigatingUnknown2026-10-07
Saitama Pref.: Shibusawa MIX admin-system intrusion may have exposed about 2,200 members’ data埼玉県InvestigatingUnknown2026-10-07
MrMax: app/online-store intrusion leaked member personal dataミスターマックスConfirmedUnknown2026-10-06
Weathercaster Network: website intrusion may have exposed up to 15,959 member/contact records気象キャスターネットワークInvestigatingUnknown2026-10-06
nimoca: usage-history service intrusion leaked card numbers etc. in 521 casesニモカConfirmed521 Records2026-10-06
Scala Communications: i-ask intrusion may have exposed enquiry data for up to 5 client tenantsスカラコミュニケーションズInvestigatingUnknown2026-10-06
Citizen Watch: vendor form-system intrusion may have exposed about 100,000 inquiry recordsシチズン時計InvestigatingUnknown2026-10-06
Nakabayashi: data of 1,826 graduate applicants leaked via ApplyNow platform breachナカバヤシConfirmed1,826 Records2026-10-06
Active: SQL injection on EC site may have exposed up to 54,916 customer recordsアクティブInvestigatingUnknown2026-10-06
Yamaguchi University: staff mailbox compromise may have exposed 967 contact records山口大学Investigating967 Records2026-10-06
OfferBox: misconfiguration may have exposed student names/emails in enterprise page traffici-plugInvestigatingUnknown2026-10-05
Furusato Choice: Amazon Pay donation bug showed another user’s application data in 254 casesトラストバンクConfirmed254 Records2026-10-05
GMO Research & AI infoQ: member data exfiltrated via vulnerability (up to 948,498); points fraudulently exchangedGMOリサーチ&AIConfirmedUnknown2026-10-05
Kufu Company: Machi Talk beta intrusion leaked user email addressesくふうカンパニーConfirmedUnknown2026-10-05
Daiki Suisan: app intrusion may have exposed personal data on 174,933 members大起水産Investigating174,933 People2026-10-05
Mikuri-gaike Onsen: Temairazu intrusion may have exposed guest reservation dataみくりが池温泉InvestigatingUnknown2026-10-05