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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
Possible personal-data leak after unauthorized access to Raksul print-submission systemsラクスル株式会社InvestigatingUnknown2026-11-09
SEGA reports 2,196,044 newsletter email-address records exposed through Arara株式会社セガConfirmed2,196,044 Records2026-11-09
Waseda confirms acquisition of 3,342 authentication-related user records早稲田大学Confirmed3,342 Records2026-11-09
Sato Food Service: 318,513 Sato Kids Club email addresses leaked via AraraサトフードサービスConfirmed318,513 Records2026-11-07
Signal Talk Maru-Jan: member email addresses and passwords leaked after intrusionシグナルトークConfirmedUnknown2026-11-07
Pacific League Marketing: email addresses leaked via Arara (five clubs) and a Lotte Marines site intrusionアララ株式会社, パシフィックリーグマーケティングConfirmedUnknown2026-11-06
MOTEX: customer data (company names, names, emails, phones) may have leaked after website intrusionエムオーテックスInvestigatingUnknown2026-11-06
Thirty-Three Bank: data of 914 free-loan customers leaked via SMBC Consumer Finance guarantee breach三十三銀行Confirmed914 People2026-11-06
TeamSpirit: 28,824 personal-data records of customer users and staff leaked via development-server intrusionチームスピリットConfirmed28,824 Records2026-11-06
2rinkan reports possible personal-data leak at roadside-service contractor株式会社２りんかんイエローハットInvestigatingUnknown2026-11-06
JNSA: user data may have leaked after intrusion into its security-literacy check serviceJNSAInvestigatingUnknown2026-11-06
EDION: customer data may have leaked after intrusion into e-commerce site log storageエディオンInvestigatingUnknown2026-11-06
Shiseido confirms exposure of 2,515 skin-analysis data records株式会社資生堂Confirmed2,515 Records2026-11-06
Bank of Okinawa: data of 211 Chekit loan customers viewed; possible leak via collection vendor沖縄銀行Investigating211 People2026-11-06
Sendai City: My Number card reservation email addresses may have leaked via Arara breach仙台市InvestigatingUnknown2026-11-06
Possible leak of SmartNews partner emails and internal user IDsスマートニュース株式会社InvestigatingUnknown2026-11-06
BitCash (WebMoney): some payment data may have leaked after unauthorised accessBitCashInvestigatingUnknown2026-11-06
Mitsui Direct: about 234,000 customer records leaked via website intrusion三井ダイレクト損害保険ConfirmedUnknown2026-11-06
Mitsui Fudosan &BIZ: 133,323 email addresses leaked via Arara system used by contractor三井不動産Confirmed133,323 Records2026-11-05
Hokuyo Bank: Super Arca card-loan customer data leaked via SMBC Consumer Finance guarantee breach北洋銀行ConfirmedUnknown2026-11-05