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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
Animate: 140,443 email addresses leaked via mail-delivery provider株式会社アニメイトConfirmed140,443 Records2026-10-28
Resona Bank: customer emails may have leaked via Cuenote FC breachりそな銀行InvestigatingUnknown2026-10-27
Saitama Resona Bank: customer emails may have leaked via Cuenote FC breach埼玉りそな銀行InvestigatingUnknown2026-10-27
Kansai Mirai Bank: customer emails may have leaked via Cuenote FC breach関西みらい銀行InvestigatingUnknown2026-10-27
So-net member database breachソニーネットワークコミュニケーションズ株式会社ConfirmedUnknown2026-10-27
BANDAI SPIRITS: 346,247 THE GUNDAM BASE MEMBERS email addresses leaked via Ymir Link breachBANDAI SPIRITSConfirmed346,247 Records2026-10-27
Rakuten Travel: customer data may have been exposed via intrusions into overseas-hotel and multilingual booking sites楽天グループInvestigatingUnknown2026-10-26
ValueCommerce: 6,096 unique address-book emails may have been taken via Cuenote FC breachバリューコマースInvestigating6,096 Records2026-10-26
Cybozu: newsletter recipient emails may have leaked via Cuenote FC breachサイボウズInvestigatingUnknown2026-10-26
Yakult Honsha: 39,505 personal-data records leaked via website intrusionヤクルト本社Confirmed39,505 Records2026-10-26
Mainichi Shimbun: newsletter email addresses may have leaked via Cuenote FC breach毎日新聞社InvestigatingUnknown2026-10-26
Nomura Securities: i-Port subscriber emails may have leaked via email-contractor breach野村證券InvestigatingUnknown2026-10-23
Sendai Gender Equal Foundation: newsletter data may have leaked via Blastmail breachせんだい男女共同参画財団InvestigatingUnknown2026-10-22
Capcom: email addresses and IDs of 11,774,247 CAPCOM ID accounts leakedカプコンConfirmed11,774,247 Accounts2026-10-22
DNP honto: newsletter member data may have leaked via Cuenote FC breach大日本印刷InvestigatingUnknown2026-10-21
Osaka University: data of 77,851 people leaked after contractor NEC's shared files were downloaded大阪大学Confirmed77,851 People2026-10-21
Blastmail breach: all subscriber-account data and some delivery lists taken株式会社ラクスConfirmedUnknown2026-10-21
Osaka Metropolitan University: related personal data leaked after NEC-subcontractor cyber-attack大阪公立大学ConfirmedUnknown2026-10-21
NEC: subcontractor cyber-attack caused customer system outages and leak of files including personal dataNECConfirmedUnknown2026-10-20
NTTPC: customer email addresses may have leaked via Cuenote FC breachNTTPCコミュニケーションズInvestigatingUnknown2026-10-20