Coverage of cybersecurity incidents, policy, privacy, public-service disruptions, advisories, and regional developments involving Japan.
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Background for this topic.
Japan covers cybersecurity and information-security developments connected to Japan, including incidents, policy, privacy, advisories, research, and news affecting organizations, public services, and digital systems in the area.
For practitioners, the tag provides geographic context for developments involving Japan's organizations, services, partners, and users. Individual articles provide the specific technologies, threats, sectors, and operational implications relevant to each development.
On December 4, 2025, a 17-year-old was arrested in Osaka under Japan’s Unauthorized Access Prohibition Act. The young man had run malicious code to extract the personal data of over 7 million users of Kaikatsu Club, Japan's largest internet cafe chain. When asked, the young man shared his motivation for the hack: he wanted to buy Pokémon cards