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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
Doshisha University: ransomware on exam-prep portal may have leaked student emails同志社大学InvestigatingUnknown2026-08-19
WEBLIFE: OEM customer-management intrusion may have leaked emails and related dataウェブライフInvestigatingUnknown2026-08-18
VOISING: BI-tool intrusion leaked about 170,000 customers’ personal dataVOISINGConfirmedUnknown2026-08-18
Kyoiku Software: dormant-server ransomware may have exposed 4,627 self-scoring-system users教育ソフトウェアInvestigating4,627 Records2026-08-17
KBC Gakuen: DM name/address row shift mailed 2,471 people’s names to wrong householdsKBC学園Confirmed2,471 People2026-08-17
SAKURA internet: intrusions into rental servers and sales system; 1,360,563 member accounts possibly viewed or takenさくらインターネットConfirmed1,360,563 Accounts2026-08-17
Ryomo Systems: VPN ransomware intrusion may have exposed business-partner and customer personal data両毛システムズInvestigatingUnknown2026-08-15
Charm: customer delivery data possibly leaked after intrusion into online pet storeチャームConfirmedUnknown2026-08-13
Tokyo Gas Network: lost work PC may have exposed about 20,000 customer records東京ガスネットワークInvestigatingUnknown2026-08-13
Akatake Engineering: ransomware incident may have exposed staff and partner-contact personal data赤武エンジニアリングInvestigatingUnknown2026-08-13
White Essence: reservation-site vulnerability led to exfiltration of about 1.05 million accounts’ dataホワイトエッセンスConfirmedUnknown2026-08-12
RIZAP APORITO: malicious script may have exfiltrated orderers’ personal and card dataRIZAPInvestigatingUnknown2026-08-10
Godai Isabou Net: server intrusion may have exposed members’ names and passwords五大開発InvestigatingUnknown2026-08-10
Nissan Foundation: website intrusion may have exposed form users’ names and emails日産財団InvestigatingUnknown2026-08-10
Digital Agency: login-history file sent to another ministry wrongly included data on 150 licensing-body staffデジタル庁Confirmed150 People2026-08-07
PMDA: lost work USB exposed personal data on 286 consultation-related contacts医薬品医療機器総合機構Confirmed286 People2026-08-07
JST: staff mailbox intrusion may have leaked stored email contents科学技術振興機構InvestigatingUnknown2026-08-07
Sapporo Toyohira: winter road-closure page wrongly posted residential-map names (259 entries)札幌市Confirmed259 Records2026-08-07
Ichimasa: employee mailbox intrusion may have exposed partner and staff personal data一正蒲鉾InvestigatingUnknown2026-08-06
Loginet Japan: Fuso Dentsu cloud intrusion may have leaked Yukinomizu customer/partner dataロジネットジャパンInvestigatingUnknown2026-08-06