Surge in Cyberattacks Leads to Data Leaks Across Multiple Japanese Firms

• •Multiple Japanese firms reported significant data leaks on October 6, 2026.
• •Josys reported a doubling of inquiries from businesses regarding data breaches in Q3 2026.
• •96% of Nikkei-listed companies confirmed data compromises in the past three years.

On October 6, 2026, multiple Japanese companies, including a Yakiniku chain and a retailer, reported significant customer data leaks due to unauthorized access. A cybersecurity firm, Josys, noted a doubling of inquiries from businesses regarding data breaches in the third quarter of 2026. A survey indicated that 96% of companies in the Nikkei stock index had experienced data compromises in the last three years. The rise in cyberattacks is attributed to advancements in AI that have removed language barriers for attackers. Josys warns that once attackers gain access, they can gradually exfiltrate more information. The exact details of the breaches, including the number of affected records and specific vulnerabilities, remain unclear. However, the incidents have raised concerns about the security practices of Japanese firms, many of which are still using outdated technologies.