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574 results
Disclosed 2026-05-21Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Geniee: unauthorized access to GENIEE MA[Credential abuse][Financial loss]Organizations 1Disclosed 2026-05-21Updated 2026-10-22Kanagawa[Contained][Severity: Major]
Sodick: unauthorized access to its servers[Intrusion][Data leak]Organizations 1Disclosed 2026-05-19Updated 2026-10-22Ishikawa[Contained][Severity: Major]
Ishikawa Computer Center: unauthorized access to the attachment-separation mail server[Web app exploit][Data leak][Service outage]Leaked 14.1KOrganizations 1Disclosed 2026-05-15Updated 2026-10-23Aichi[Contained][Severity: Critical]
CKC Network and Gakusan: ransomware attack on the inquiry system[Ransomware][Web app exploit][Data leak]Leaked 664KOrganizations 2Disclosed 2026-05-15Updated 2026-10-23Tokyo[Resolved][Severity: Moderate]
CS Accounting: unauthorized access to its servers[Credential abuse]Organizations 1Disclosed 2026-05-14Updated 2026-10-22Tokyo[Contained][Severity: Major]
Nihon Shisan Souken: ransomware attack[Ransomware][Credential abuse][Data leak][Service outage][Extortion]Organizations 1Disclosed 2026-05-12Updated 2026-10-22Tokyo[Investigating][Severity: Major]
Oriental Diamond: ransomware attack[Ransomware][Data leak][Service outage]Organizations 1Disclosed 2026-05-12Updated 2026-10-22Tokyo[Contained][Severity: Critical]
Tokyo Hoso Kogyo: ransomware attack[Ransomware][Data leak]Organizations 1Disclosed 2026-05-09Updated 2026-10-22Tokyo[Contained][Severity: Critical]
Matsuzawa Shoten: ransomware attack[Ransomware][Service outage]Organizations 1Disclosed 2026-05-08Updated 2026-10-22Aichi[Contained][Severity: Critical]
JR Tokai Takashimaya: unauthorized access to the part-time staff system[Web app exploit][Data leak]Leaked 7.6KOrganizations 1Disclosed 2026-05-07Updated 2026-10-22Tokyo[Contained][Severity: Major]
East: unauthorized access to its internal network[Intrusion][Data leak]Organizations 1Disclosed 2026-05-01Updated 2026-10-23Miyagi[Contained][Severity: Critical]
Tohoku University: intrusion into university servers and Tohoku University Hospital NAS[Intrusion][Data leak]Organizations 2Disclosed 2026-05-01Updated 2026-10-22Tokyo[Contained][Severity: Major]
Money Forward: unauthorized access to its GitHub[Credential abuse][Data leak]Leaked 60.4KOrganizations 1Disclosed 2026-04-30Updated 2026-10-23Aichi[Contained][Severity: Major]
Toyota Mobility Parts: intrusion into James member servers[Intrusion][Data leak]Organizations 1Disclosed 2026-04-28Updated 2026-10-22Niigata[Investigating][Severity: Major]
Marutake: ransomware attack[Ransomware][Data leak][Service outage][Extortion]Organizations 1Disclosed 2026-04-23Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Yellow Hat: member data taken through the 2Rinkan app API[API abuse][Data leak][Service outage]Leaked 3.5MOrganizations 1Disclosed 2026-04-10Updated 2026-10-23Tokyo[Contained][Severity: Moderate]
UPSIDER: supply chain attack through open source software[Malware][Service outage]Organizations 1Disclosed 2026-04-09Updated 2026-10-22Tokyo[Contained][Severity: Major]
NYK: unauthorized access to the marine fuel procurement system[Intrusion][Data leak][Service outage]Organizations 1Disclosed 2026-04-08Updated 2026-10-22Tokyo[Investigating][Severity: Major]
ielove GROUP: unauthorized access to the ielove CLOUD real estate service[Credential abuse][Web app exploit][Data leak]Organizations 1Disclosed 2026-04-03Updated 2026-10-23Kanagawa, Tokyo[Contained][Severity: Critical]
CAMPFIRE: unauthorized access to its GitHub account[Credential abuse][Data leak]Leaked 225.8KOrganizations 2Disclosed 2026-04-03Updated 2026-10-23Yamagata[Contained][Severity: Critical]
YCC Information System: ransomware attack[Ransomware][Credential abuse][Data leak][Service outage]Leaked 121.9KOrganizations 7Disclosed 2026-04-03Updated 2026-10-22Tokushima[Contained][Severity: Major]
Awa Bank: unauthorized access to an OA system test environment[Intrusion][Misconfiguration][Data leak]Leaked 27.7KOrganizations 1Disclosed 2026-03-30Updated 2026-10-23Kyoto[Resolved][Severity: Major]
Cota: cyberattack causes a system outage[Intrusion][Data leak][Service outage]Leaked 55.4KOrganizations 1Disclosed 2026-03-26Updated 2026-10-22Oita[Contained][Severity: Critical]
Zynas: cyberattack on Joyfull's HR contractor[Intrusion][Data leak]Leaked 23.6KOrganizations 2Disclosed 2026-03-26Updated 2026-10-22Fukuoka[Investigating][Severity: Critical]
MoonStar: unauthorized access to system servers[Intrusion][Data leak]Leaked 593KOrganizations 1Disclosed 2026-03-24Updated 2026-10-23Tokyo[Contained][Severity: Major]
Cynd: unauthorized access to the BeautyMerit booking system[Unknown][Data leak]Organizations 1Disclosed 2026-03-23Updated 2026-10-23Osaka[Contained][Severity: Major]
Omikenshi: ransomware attack[Ransomware][Credential abuse][Data leak][Service outage]Organizations 1Disclosed 2026-03-19Updated 2026-10-22Hiroshima[Contained][Severity: Major]
Mazda: unauthorized access to a parts warehouse system[Intrusion][Data leak]Leaked 692Organizations 1Disclosed 2026-03-17Updated 2026-10-23Osaka[Contained][Severity: Critical]
Medicus Shuppan, Publishers: ransomware attack[Ransomware][Credential abuse][Data leak][Service outage]Leaked 772KOrganizations 1Disclosed 2026-03-16Updated 2026-10-22Osaka[Contained][Severity: Major]
Iwatani: unauthorized access to group systems[Intrusion][Data leak]Organizations 1Disclosed 2026-03-09Updated 2026-10-23Fukuoka[Resolved][Severity: Major]
Uchiyama Holdings: ransomware attack[Ransomware][Data leak]Organizations 1Disclosed 2026-03-06Updated 2026-10-24 03:51Kanagawa, Tokyo[Resolved][Severity: Moderate]
Seed Planning: ransomware attack[Ransomware][Service outage]Leaked 130KOrganizations 4Disclosed 2026-03-06Updated 2026-10-23Kyoto[Contained][Severity: Critical]
Murata: intrusion into the information-sharing system[Intrusion][Data leak]Leaked 73KOrganizations 1Disclosed 2026-03-03Updated 2026-10-23Shizuoka[Investigating][Severity: Critical]
Shiraume Toyooka Hospital: ransomware attack on the hospital and care home[Ransomware][Data leak][Service outage]Organizations 1Disclosed 2026-02-19Updated 2026-10-26 18:29Tokyo[Contained][Severity: Major]
Advantest: ransomware attack[Ransomware][Intrusion][Data leak][Service outage]Organizations 1Disclosed 2026-02-14Updated 2026-10-23Aichi[Resolved][Severity: Major]
Washington Hotel: ransomware attack[Ransomware][Intrusion][Service outage][Data leak]Organizations 1Disclosed 2026-02-13Updated 2026-10-23Kanagawa[Resolved][Severity: Major]
Nishiyama Seisakusho: ransomware attack on its network[Ransomware][Credential abuse][Service outage][Data leak]Organizations 1Disclosed 2026-02-13Updated 2026-10-23Kanagawa[Contained][Severity: Critical]
Nippon Medical School Musashi Kosugi Hospital: ransomware attack[Ransomware][Intrusion][Data leak][Service outage]Leaked 130KOrganizations 1Disclosed 2026-02-13Updated 2026-10-23Tokyo[Contained][Severity: Critical]
BEENOS: unauthorized access to the Sekaimon overseas shopping service[Web app exploit][Data leak][Service outage]Organizations 1Disclosed 2026-02-12Updated 2026-10-23Tokyo[Resolved][Severity: Major]
Ficha: ransomware attack on its servers[Ransomware][Data leak]Organizations 1Disclosed 2026-02-12Updated 2026-10-23Tokyo[Contained][Severity: Major]
Mynavi: unauthorized access to a cloud service it uses[Unknown][Data leak]Leaked 74.2KOrganizations 1Disclosed 2026-02-12Updated 2026-10-22Niigata[Investigating][Severity: Critical]
Gala Yuzawa: ransomware attack on the lift ticket system[Ransomware][Misconfiguration][Data leak][Service outage]Leaked 1.5KOrganizations 1Disclosed 2026-02-06Updated 2026-10-23Osaka[Contained][Severity: Major]
GEX: ransomware attack[Ransomware][Data leak][Service outage]Leaked 77.6KOrganizations 1Disclosed 2026-02-05Updated 2026-10-23Tokyo[Contained][Severity: Critical]
At Home: unauthorized login to the moving quote system[Credential abuse][Data leak][Service outage]Leaked 5.1KOrganizations 1Disclosed 2026-02-04Updated 2026-10-23Kagawa[Contained][Severity: Major]
Anabuki Kosan: ransomware attack on the group[Ransomware][Intrusion][Data leak][Service outage]Organizations 1Disclosed 2026-02-04Updated 2026-10-23Osaka[Contained][Severity: Critical]
F-one: ransomware attack[Ransomware][Intrusion][Data leak][Service outage][Extortion]Leaked 170KOrganizations 1Disclosed 2026-02-03Updated 2026-10-23Kagawa[Contained][Severity: Critical]
Anabuki Housing Service: ransomware attack on the group[Ransomware][Data leak][Service outage]Leaked 496KOrganizations 1Disclosed 2026-02-03Updated 2026-10-23Osaka[Contained][Severity: Critical]
Hosokawa Micron: unauthorized cloud storage login[Credential abuse][Data leak]Leaked 1.5KOrganizations 1Disclosed 2026-01-26Updated 2026-10-22Wakayama[Contained][Severity: Critical]
Interix: card data leaked from the Just Curtain online shop[Web app exploit][Data leak][Fraud]Leaked 60.7KOrganizations 1Disclosed 2026-01-22Updated 2026-10-23Tokyo[Contained][Severity: Major]
Sincere: ransomware attack[Ransomware][Service outage][Data leak]Organizations 1