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574 results
Disclosed 2026-01-21Updated 2026-10-23Osaka[Investigating][Severity: Major]
Suntory: unauthorized access at a PR contractor[Ransomware][Data leak]Leaked 914Organizations 1Disclosed 2026-01-20Updated 2026-10-23Toyama[Contained][Severity: Critical]
Tombow Beverage: ransomware attack[Ransomware][Data leak]Organizations 1Disclosed 2026-01-19Updated 2026-10-22Fukuoka[Contained][Severity: Critical]
JR Kyushu: unauthorized access to the group network[Intrusion][Data leak]Leaked 14.6KOrganizations 1Disclosed 2026-01-08Updated 2026-10-23Fukui[Resolved][Severity: Moderate]
Kowa Emori: ransomware outage[Ransomware][Service outage]Organizations 1Disclosed 2026-01-08Updated 2026-10-23Osaka[Contained][Severity: Major]
Smaregi: store customer data leaked from an app linked to its POS[Misconfiguration][Data leak]Leaked 136.3KOrganizations 8Disclosed 2026-01-08Updated 2026-10-22Okinawa[Investigating][Severity: Critical]
Okinawa Prefectural College of Nursing: ransomware attack on its academic system[Ransomware][Service outage]Organizations 1Disclosed 2026-01-06Updated 2026-10-22Tokyo[Resolved][Severity: Major]
CANVASs: ransomware attack on its licensing server[Ransomware][Service outage]Organizations 1Disclosed 2026-01-06Updated 2026-10-22Tokyo[Investigating][Severity: Moderate]
Mizuho Leasing: unauthorized access to a power investment system[Unknown]Organizations 1Disclosed 2026-01-05Updated 2026-10-23Tokyo[Resolved][Severity: Major]
CAC: unauthorized access to the Academic Support Navi donation service[Credential abuse][Malware][Service outage]Organizations 1Disclosed 2025-12-30Updated 2026-10-23Aichi[Contained][Severity: Critical]
K.UNO: web system intrusion[Intrusion][Data leak][Service outage]Organizations 1Disclosed 2025-12-26Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Keio University: intrusion into the SFC email system[Intrusion][Data leak]Leaked 222.5KOrganizations 1Disclosed 2025-12-25Updated 2026-10-23Tokyo[Investigating][Severity: Major]
Alcare: work phone account taken over[Phishing][Credential abuse][Data leak]Leaked 400Organizations 1Disclosed 2025-12-23Updated 2026-10-23Tokyo[Contained][Severity: Critical]
FUJIFILM Medical: sales system intrusion[Credential abuse][Data leak]Leaked 590KOrganizations 1Disclosed 2025-12-19Updated 2026-10-23Shizuoka[Contained][Severity: Critical]
TOKAI Communications: unauthorized access to OneOffice Mail Solution[Intrusion][Data leak][Service outage]Leaked 3.6MOrganizations 1Disclosed 2025-12-18Updated 2026-10-23Aichi[Contained][Severity: Major]
Kawamoto Pump Mfg.: inquiry data leaked[Intrusion][Data leak]Leaked 2.5KOrganizations 1Disclosed 2025-12-12Updated 2026-10-23Tokyo[Resolved][Severity: Moderate]
Tokyo Hanyaku: website defaced[Intrusion][Site defacement][Service outage]Organizations 1Disclosed 2025-11-28Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Mitsubishi Paper Mills: intrusion through remote access[Intrusion][Data leak]Leaked 2.4KOrganizations 1Disclosed 2025-11-27Updated 2026-10-23Tokyo[Contained][Severity: Major]
Shin Nihon Kentei Kyokai: ransomware attack[Ransomware][Data leak][Service outage]Leaked 30KOrganizations 5Disclosed 2025-11-13Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Tokai Software Development: ransomware leaks Tokai University data[Ransomware][Credential abuse][Data leak][Service outage]Leaked 193.1KOrganizations 2Disclosed 2025-11-11Updated 2026-10-23Tokyo[Contained][Severity: Major]
Gakken Medical Support: account permission error[Misconfiguration][Data leak]Leaked 600Organizations 1Disclosed 2025-11-11Updated 2026-10-23Tokyo[Contained][Severity: Moderate]
National Diet Library: development environment intrusion; suspected leak ruled out[Intrusion]Leaked 40.4KOrganizations 2Disclosed 2025-11-06Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Kobayashi: server data stolen[Intrusion][Data leak]Leaked 8.1KOrganizations 1Disclosed 2025-11-04Updated 2026-10-23Tokyo[Contained][Severity: Major]
Nikkei: unauthorized access to its Slack[Malware][Credential abuse][Data leak]Leaked 17.4KOrganizations 1Disclosed 2025-10-31Updated 2026-10-22Tokyo[Contained][Severity: Critical]
Universal Music: unauthorized access to UNIVERSAL MUSIC STORE and other online stores[Intrusion][Data leak][Service outage]Leaked 3.1MOrganizations 1Disclosed 2025-10-23Updated 2026-10-22Kanagawa, Tokyo[Contained][Severity: Critical]
Enessance: ransomware attack[Ransomware][Data leak][Service outage][Extortion]Leaked 365KOrganizations 2Disclosed 2025-10-20Updated 2026-10-23Kanagawa[Contained][Severity: Critical]
Fukuyoshi: card data at its online shop may have been exposed[Web app exploit][Data leak][Service outage]Leaked 12.6KOrganizations 1Disclosed 2025-10-19Updated 2026-10-26 18:29Tokyo[Resolved][Severity: Critical]
Askul: ransomware attack[Ransomware][Credential abuse][Service outage][Data leak][Extortion]Leaked 600KOrganizations 3Disclosed 2025-10-15Updated 2026-10-23Kyoto[Contained][Severity: Moderate]
Sagawa: unauthorized logins to Smart Club[Credential abuse][Service outage]Organizations 1Disclosed 2025-10-14Updated 2026-10-23Tokyo[Investigating][Severity: Critical]
Yamato Transport: former employee took business partner data[Insider][Data leak]Leaked 26.8KOrganizations 11,356Disclosed 2025-10-04Updated 2026-10-23Gifu[Resolved][Severity: Critical]
Mino Industry: ransomware attack[Ransomware][Credential abuse][Data leak][Service outage][Extortion]Organizations 1Disclosed 2025-10-03Updated 2026-10-23Tokyo[Contained][Severity: Major]
JFC: data exposed by the business plan application system[Misconfiguration][Data leak]Leaked 4.9KOrganizations 1Disclosed 2025-10-03Updated 2026-10-23Tokyo[Contained][Severity: Major]
Mynavi: device management cloud misconfiguration[Misconfiguration][Data leak]Leaked 14.8KOrganizations 1Disclosed 2025-09-29Updated 2026-10-26 18:29Tokyo[Resolved][Severity: Critical]
Asahi Group: ransomware attack[Ransomware][Intrusion][Service outage][Data leak][Extortion]Leaked 1.5MOrganizations 1Disclosed 2025-09-19Updated 2026-10-23Tokyo[Contained][Severity: Major]
Pasona: support scam exposes a PC used in a Tokyo job-matching program[Intrusion][Data leak]Leaked 800Organizations 2Disclosed 2025-09-10Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Community Network: CN Playguide personal data may have been exposed[Intrusion][Data leak]Leaked 236.3KOrganizations 1Disclosed 2025-09-10Updated 2026-10-23Hyogo[Investigating][Severity: Critical]
Nikke: server intrusion and data leakage[Intrusion][Credential abuse][Data leak]Organizations 1Disclosed 2025-09-09Updated 2026-10-23Okayama[Investigating][Severity: Moderate]
Tiger Chiyoda: ransomware attack[Ransomware][Service outage]Organizations 1Disclosed 2025-09-02Updated 2026-10-23Kanagawa[Contained][Severity: Critical]
Ryochi: server intrusion[Intrusion][Data leak]Leaked 450KOrganizations 1Disclosed 2025-08-29Updated 2026-10-23Nagasaki[Resolved][Severity: Critical]
Huis Ten Bosch: ransomware attack[Ransomware][Data leak][Service outage]Leaked 1.5MOrganizations 1Disclosed 2025-08-22Updated 2026-10-23Shizuoka[Contained][Severity: Major]
Nihon Plast: development center server intrusion[Intrusion][Service outage][Data leak]Organizations 1Disclosed 2025-08-21Updated 2026-10-23Gifu[Resolved][Severity: Critical]
Seino: intrusion into its web services[Intrusion][Data leak][Service outage]Leaked 1.8KOrganizations 1Disclosed 2025-08-15Updated 2026-10-23Ehime[Contained][Severity: Critical]
Miura: network intrusion[Intrusion][Credential abuse][Service outage][Data leak]Leaked 161.4KOrganizations 1Disclosed 2025-08-08Updated 2026-10-23Osaka[Contained][Severity: Major]
USAC System: ransomware attack[Ransomware][Service outage][Data leak]Leaked 2.6KOrganizations 1Disclosed 2025-07-25Updated 2026-10-22Tokyo[Investigating][Severity: Critical]
AXA General Insurance: unauthorized access to the pet insurance system[Intrusion][Data leak]Leaked 553KOrganizations 1Disclosed 2025-07-22Updated 2026-10-23Aichi[Investigating][Severity: Critical]
Kawasaki Setsubi Kogyo: ransomware encrypts its cloud servers[Ransomware][Service outage][Data leak]Organizations 1Disclosed 2025-07-14Updated 2026-10-23Osaka[Contained][Severity: Critical]
Shinko Shuppansha Keirinkan: SQL injection at Smart Lecture[Web app exploit][Data leak]Organizations 1Disclosed 2025-07-12Updated 2026-10-23Tokyo[Contained][Severity: Major]
Trustbank: unauthorized logins to LoGo Form[Credential abuse][Data leak]Leaked 399Organizations 1Disclosed 2025-07-11Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Shinchosha: ransomware attack[Ransomware][Data leak][Service outage]Leaked 89KOrganizations 1Disclosed 2025-07-08Updated 2026-10-23Tokyo[Contained][Severity: Major]
NS Solutions: zero-day intrusion[Intrusion][Data leak]Organizations 1Disclosed 2025-07-01Updated 2026-10-23Tokyo[Investigating][Severity: Moderate]
Shinko Plastics: ransomware attack[Ransomware][Service outage]Organizations 1