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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
Frau International: 3,560 inquiry personal-data items may have leaked via outsourced mail-admin intrusionフラウ・インターナショナルInvestigating3,560 Records2026-07-07
Nagano Prefecture: bid and public-works evaluation drawings publicly posted with names and lot numbers長野県ConfirmedUnknown2026-07-06
IPSJ: 544 young-researchers’ member records may have been viewable by unintended parties情報処理学会Investigating544 Records2026-07-06
TV Asahi Mediaplex: employee/applicant/partner data may have leaked after server intrusionテレビ朝日メディアプレックスInvestigatingUnknown2026-07-03
Kitakyushu City: flawed PDF masking left personal data of 1,139 people viewable in released files北九州市Confirmed1,139 People2026-07-03
Nakabayashi REVEX: after site tampering, 3,631 inquiry records may have been exposedナカバヤシInvestigating3,631 Records2026-07-02
Ainex: phishing-led mailbox intrusion leaked 373 email addressesアイネックスConfirmed373 Records2026-07-01
Kaga Solnet Academico Navi: vulnerability abuse leaked personal data of 165,587 registrants加賀ソルネットConfirmed165,587 People2026-07-01
Reqrea Tabiq: ID-document images for 1,060,338 guests may have been publicly reachable via S3 misconfigurationリクリエInvestigating1,060,338 People2026-06-30
FLOW (LyuVie): 1,593 shop customers’ names/emails may have leaked via MeruhaikunFLOWInvestigating1,593 Records2026-06-30
Aflac: customer personal data leaked after intrusion into policyholder systemsアフラック生命保険ConfirmedUnknown2026-06-30
Edogawa City: SD card loss exposed personal data of 904 students江戸川区Confirmed904 People2026-06-29
Gotouchi Character Association: contact data may have leaked after NAS ransomware日本ご当地キャラクター協会InvestigatingUnknown2026-06-29
Chitose JAL Marathon: volunteer roster page may have leaked after becoming search-indexable千歳JAL国際マラソン実行委員会InvestigatingUnknown2026-06-26
Miyagi Prefecture: Ishinomaki HS mis-posted graded exams for 182 students宮城県Confirmed182 People2026-06-26
Ishigaki City: student data may have leaked after teacher PC support-scam remote access石垣市InvestigatingUnknown2026-06-25
ELEC: user data may have leaked via Meruhaikun intrusion英語教育協議会InvestigatingUnknown2026-06-25
Komatsushima City: farmland data for 1,906 farmers mis-emailed to one farm corporation小松島市Confirmed1,906 Records2026-06-25
Japan Auction Association: 523 customer records may have been viewed after mailbox intrusion日本オークション協会Investigating523 Records2026-06-24
Ibaraki SME Global: 297 support-company emails leaked via CC blastいばらき中小企業グローバル推進機構Confirmed297 Records2026-06-24