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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
J:COM: email addresses of J:COM NET and partner cable users leaked via KDDI mail platform breachJCOMConfirmedUnknown2026-06-23
BIGLOBE: email addresses of 5,016,432 people leaked via KDDI mail platform breachビッグローブConfirmed5,016,432 People2026-06-23
Osaka Kyoiku University: 1,529 student/staff records leaked via wrong email attachment大阪教育大学Confirmed1,529 Records2026-06-23
Tengai Foundation: 1,834 Morita Akio Juku registrants leaked via Meruhaikun天涯文化財団Confirmed1,834 People2026-06-23
KDDI: intrusion into mail platform for six ISPs leaked email addresses of 12,231,954 peopleKDDIConfirmed12,231,954 People2026-06-23
Chubu Telecommunications commufa mail: 727,176 people affected via KDDI mail platform breach中部テレコミュニケーションConfirmed727,176 People2026-06-23
KDDI Web Communications CPI mail: email addresses of 1,250,543 people leaked via KDDI platform breachKDDIウェブコミュニケーションズConfirmed1,250,543 People2026-06-23
STNet Pikara mail: addresses and passwords of 397,152 people leaked via KDDI platform breachSTNetConfirmed397,152 People2026-06-23
Unirita: mail-magazine contacts may have leaked via Meruhaikun intrusionユニリタInvestigatingUnknown2026-06-22
ANDMAMACO: registrant data may have leaked via Meruhaikun intrusionANDMAMACOInvestigatingUnknown2026-06-22
Hands Holdings: investigating possible personal-data leak after suspected malwareハンズホールディングスInvestigatingUnknown2026-06-22
Fujikura Composites: data may have leaked after suspected Exchange Online mailbox intrusion藤倉コンポジットInvestigatingUnknown2026-06-22
JSEG: 1,644 newslist emails/names leaked via Meruhaikun日本応用地質学会Confirmed1,644 People2026-06-22
e-Clinic: newsletter data may have leaked via Meruhaikun intrusioneクリニックInvestigatingUnknown2026-06-20
Gendai Butsudan: customer/partner data may have leaked after mail-server intrusion現代仏壇InvestigatingUnknown2026-06-19
Kyoto Experiment: newsletter data may have leaked via Meruhaikun intrusion京都国際舞台芸術祭実行委員会InvestigatingUnknown2026-06-19
Sado City: 4,111 Toki Fan Club emails may have leaked via Meruhaikun佐渡市Investigating4,111 People2026-06-19
Include Inc: 2,243 newsletter registrants may have leaked via MeruhaikunインクルードInvestigating2,243 People2026-06-19
TOMOWEL Payment Service: customer/contact data may have leaked via MeruhaikunTOMOWEL Payment ServiceInvestigatingUnknown2026-06-19
JSPO: community-club newsletter emails may have leaked via Meruhaikun intrusion日本スポーツ協会InvestigatingUnknown2026-06-18