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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
Plenus: Hotto Motto newsletter vendor breach leaked member data (up to about 7 million records)プレナスConfirmedUnknown2026-11-04
Kracie Yakuhin Kampoful Life: 59,428 member email addresses leaked via Araraクラシエ薬品Confirmed59,428 Records2026-11-04
BOATRACE Promotion: Telebote newsletter email addresses leaked via Arara breach (up to 684,772)BOATRACE振興会ConfirmedUnknown2026-11-04
Hasegawa: 305 customer email addresses leaked via Arara breachはせがわConfirmed305 Records2026-11-04
Mitsui Sumitomo Insurance: about 37,000 customer records leaked from policyholder portal intrusion三井住友海上火災保険ConfirmedUnknown2026-11-04
Aioi Nissay Dowa: about 444,000 customer records leaked from policyholder portal intrusionあいおいニッセイ同和損害保険ConfirmedUnknown2026-11-04
Monteroza: newsletter member data may have leaked via Arara breach (625,429 email addresses)アララ株式会社, モンテローザInvestigating625,429 Records2026-11-04
Shochiku Multiplex Theaters: 3,320,305 SMT Members records leaked via Arara breach松竹マルチプレックスシアターズConfirmed3,320,305 Records2026-11-04
Dentsu Soken: personal data in a client FACERE environment may have leaked via access misconfiguration電通総研InvestigatingUnknown2026-11-04
Workman: newsletter subscribers' email addresses leaked via Arara breach (up to about 1.45 million)ワークマン, アララ株式会社ConfirmedUnknown2026-11-04
Seijo Ishii: online-shop newsletter email addresses leaked via Arara breach (up to 168,630)成城石井ConfirmedUnknown2026-11-03
KALDI online store: 820,420 newsletter email addresses leaked via Arara breachキャメル珈琲, アララ株式会社Confirmed820,420 Records2026-11-03
Yokohama City: personal data may have leaked via e-application email-service intrusion横浜市InvestigatingUnknown2026-11-03
Denny's Japan: member data may have leaked after unauthorised access to its appデニーズジャパンInvestigatingUnknown2026-11-03
Asoview discloses 15,821,184 member records exposed through Araraアソビュー株式会社Confirmed15,821,184 Records2026-11-03
7NOW delivery-customer data exposed through contractor株式会社セブン‐イレブン・ジャパンConfirmedUnknown2026-11-03
Kinko's Japan: smart-membership email addresses leaked via Arara breachキンコーズ・ジャパンConfirmedUnknown2026-11-02
Life Corporation: point-card data in the official app may have been viewed after intrusion (298 records)ライフコーポレーションInvestigating298 Records2026-11-02
ManpowerGroup Japan: 158,600 email addresses leaked via Arara service used by a contractorマンパワーグループConfirmed158,600 Records2026-11-02
Subway Japan: newsletter member data leaked via Arara breach (up to 1,107,494)WATAMI FAST CASUAL MANAGEMENTConfirmedUnknown2026-11-02