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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
Ryobi Bus: 43,221 newsletter email addresses leaked via Arara breach両備バスConfirmed43,221 Records2026-11-02
Fukui Shimbun: 11,084 Fukui Shimbun Passport member email addresses leaked via Arara breach福井新聞社Confirmed11,084 Records2026-11-02
Suntory group external-cloud data breachサントリーホールディングス株式会社ConfirmedUnknown2026-11-02
Hokuriku Electric: about 550,000 Hokulink member email addresses leaked via mail-service breach北陸電力ConfirmedUnknown2026-11-02
Marui Group: customer data leaked via Securitize Japan digital-bond vendor breach (up to 9,086 people)丸井グループConfirmedUnknown2026-11-02
Bank of the Ryukyus: 96,477 customer email addresses leaked via Arara repica琉球銀行Confirmed96,477 Records2026-11-02
Odakyu Travel: 63,006 member email addresses leaked via Arara breach小田急トラベルConfirmed63,006 Records2026-11-02
istyle @cosme: data of about 3 million common-ID members leaked after unauthorised accessアイスタイルConfirmedUnknown2026-11-02
Kobe Shimbun: about 40,000 newsletter email addresses leaked via Arara breach神戸新聞社ConfirmedUnknown2026-11-02
ENEOS: car-lease customer data leaked via Prestige Core Solutions vendor breach (up to 8,500 contracts)ENEOSConfirmedUnknown2026-11-02
Skymark: employee and former-employee personal data left viewable; possible leakスカイマークInvestigatingUnknown2026-11-02
U Co-op: 210,495 email addresses leaked from Arara repica serviceユーコープConfirmed210,495 Records2026-11-02
Prestige International: up to about 5.5 million roadside-service records taken株式会社プレステージ・インターナショナルConfirmedUnknown2026-11-02
Mizkan: recipient names, addresses and phones may have leaked via Sagawa Express tracking-service breachMizkanInvestigatingUnknown2026-11-02
Tochigi Bank: about 1,000 customer email addresses leaked via Arara mail-server breach栃木銀行ConfirmedUnknown2026-11-02
Zaif: 380,536 customer email addresses leaked via Arara contractor breachZaifConfirmed380,536 Records2026-11-02
TKC: customer email addresses leaked via Arara email-delivery breach (up to 2,230,812)アララ株式会社, TKCConfirmedUnknown2026-11-02
Fanplus/Ticketplus: about 4.43 million user email addresses leaked via Arara breachFanplusConfirmedUnknown2026-11-02
Nojima Online: about 7 million member records leaked after member-system intrusionノジマConfirmedUnknown2026-11-02
Kagome: data of 109 digital-bond purchasers may have leaked via application-platform breachカゴメInvestigating109 People2026-10-31