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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
Urasoe City: data of 115,526 residents may have leaked after leased laptop theft浦添市Investigating115,526 Records2026-05-29
Fukuoka City: parent/child names may have leaked via misdelivered multi-child benefit notices福岡市InvestigatingUnknown2026-05-28
Asoview discloses satsuki guest and partner information breachアソビュー株式会社ConfirmedUnknown2026-05-28
Sanpainet: user IDs/passwords may have leaked after Yuryo Sanpai Navi intrusion産業廃棄物処理事業振興財団InvestigatingUnknown2026-05-28
Yamada Body: customer/partner data may have leaked after mail-server intrusion山田ボデー工業所InvestigatingUnknown2026-05-27
Tokyo Healthcare University: data of 105 nursing students may have leaked via Medica Publishing ransomware東京医療保健大学Investigating105 People2026-05-27
Tokyo Metro Government: nurse-scholarship system permission flaw exposed 565 people to other schools東京都Confirmed565 People2026-05-27
Icomsoft: mail personal data may have leaked after cPanel vulnerability intrusionアイコムソフトInvestigatingUnknown2026-05-27
PreMedica: newsletter sent with another customer’s name displayedプリメディカConfirmedUnknown2026-05-27
Otera Oyatsu Club: 155 book-gift applicants viewable via Google Form misconfigurationおてらおやつクラブConfirmed155 People2026-05-26
University of Kitakyushu: faculty/student data may have leaked after remote takeover of staff PC北九州市立大学InvestigatingUnknown2026-05-26
Hokuriku Electric: 202 partner email addresses leaked via misaddressed status mail北陸電力Confirmed202 Records2026-05-26
Tokyo Metro Government: Tokyo Digital Academy portal access-control flaw leaked staff data東京都ConfirmedUnknown2026-05-25
Osaka Prefecture: Misaki HS students viewed left-behind files covering 180 students大阪府Confirmed180 People2026-05-22
Japan Soccer College: 516 prospect emails exposed via To: info-session blastJAPANサッカーカレッジConfirmed516 Records2026-05-22
Yokohama DeNA BayStars: parade-supporter data may have leaked via CAMPFIRE intrusion横浜DeNAベイスターズInvestigatingUnknown2026-05-22
Kanazawa HS: guardian bank-account data may have leaked via ICC vendor intrusion金沢高等学校InvestigatingUnknown2026-05-20
Ishikawa Computer Center: 14,071 external email addresses may have leaked after attachment-mail server intrusion石川コンピュータ・センターInvestigating14,071 Records2026-05-19
Yokohama City: 104 people’s data leaked via misdelivered status-subject list横浜市Confirmed104 People2026-05-15
Tohoku Gakuin University: 628 open-course registrant emails exposed via To: blast東北学院大学Confirmed628 People2026-05-15