Data Breaches in Japan

9 data breaches have affected organizations headquartered in Japan. This geographic view helps security professionals understand regional threat patterns and compliance requirements. Organizations face various cyber threats based on regional economic activity and geopolitical factors.

Organizations operating in Japan must navigate specific regulatory requirements for breach notification and data protection. Local data protection and privacy regulations govern breach notification requirements. Understanding the breach landscape in your jurisdiction helps inform incident response planning and regulatory compliance strategies.

Compare breach activity across regions to understand where threats are concentrated. View breaches in the United States, United Kingdom, or explore by industry and incident type. For current activity, see the latest breaches worldwide.

Geographic scope: Breaches are attributed based on the headquarters location of the affected organization, not the location of data subjects or attackers.
9
Breaches in Japan
Date Company Type Industry Country Severity Source
Dec 15, 2025 Japan unauthorized access - Japan 7/10 View
Nov 28, 2025 Asahi ransomware - Japan 8/10 View
Nov 10, 2025 Nikkei unauthorized access - Japan 5/10 View
Nov 6, 2025 Nikkei Says 17000 Impacted by unauthorized access - Japan 5/10 View
Oct 9, 2025 Qilin ransomware - Japan 6/10 View
Mar 9, 2025 NTT unauthorized access Technology Japan 5/10 View
Mar 8, 2025 Japanese Telco Giant NTT Com unauthorized access Technology Japan 5/10 View
Oct 21, 2024 Japanese ransomware Technology Japan 6/10 View
Aug 4, 2024 Leaks unauthorized access Technology Japan 5/10 View

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