Mid-January – February 2026 This report summarizes publicly disclosed cybersecurity-related incidents and policy developments in Japan during the above period. 1. Cybersecurity Incidents Trend 1 | Ransomware Nippon Medical School Musashikosugi Hospital (Feb 13) A suspected ransomware attack affected internal hospital systems. Approximately 10,000 patient records were reportedly exposed.Hospitals in
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[#2 Issue] Cross-Sector Cyber Incidents and Governance Shifts in Japan February 2026 Review
Mid-January – February 2026 This report summarizes publicly disclosed cybersecurity-related incidents and policy developments in Japan during the above period.

Honoring the Life and Legacy of David J. Farber
JICSS mourns the loss of Professor David J. Farber, a founding pillar of our institute and a titan of the

[#1 Issue] The “Turning Point” – 2025 Cyber Incidents: Five-Year Risks and Countermeasures Facing Japanese Society
1. A New Reality in Digital Society In our increasingly digitized modern society, cyberattacks are no longer an issue limited