Find incidents
Cyberattacks and data leaks that hit organizations in Japan. Filter by disclosure date, method, impact and status, or by where the affected organizations are, their industry or type and size.
56 results
Disclosed 2026-02-06Updated 2026-08-19Osaka[Contained][Severity: Major]
GEX: ransomware attack[Ransomware][Data leak][Service outage]Leaked 77.6KOrganizations 1Disclosed 2026-02-04Updated 2026-04-08Osaka[Contained][Severity: Critical]
F-one: ransomware attack[Ransomware][Intrusion][Data leak][Service outage][Extortion]Leaked 170KOrganizations 1Disclosed 2026-02-03Updated 2026-03-27Osaka[Contained][Severity: Critical]
Hosokawa Micron: unauthorized cloud storage login[Credential abuse][Data leak]Leaked 1.5KOrganizations 1Disclosed 2026-01-21Updated 2026-01-21Osaka[Investigating][Severity: Major]
Suntory: unauthorized access at a PR contractor[Ransomware][Data leak]Leaked 914Organizations 1Disclosed 2026-01-08Updated 2026-03-09Osaka[Contained][Severity: Major]
Smaregi: linked POS app customer data leak[Misconfiguration][Data leak]Leaked 136.3KOrganizations 8Disclosed 2025-12-17Updated 2026-02-25 08:05Osaka[Resolved][Severity: Moderate]
Takara Standard: Shikoku branch intrusion[Intrusion]Organizations 1