City of Ota security incident history
Hacking, data breaches and other security incidents involving City of Ota, with related coverage.
Japan’s Ota warns of possible personal data leak after October disaster information system breach
27.9KImpact: Potentially affected service registrants: 27,859 residents and 2,186 staff members registered for disaster information emails, and 42 Net119 registrants. The actual number of people whose data was leaked is unconfirmed.
Signs of suspected unauthorized access were detected on October 11, 2026, in Arcadia’s information distribution system used by the city of Ota in Gunma Prefecture, Japan. On October 15, Ota announced that personal information, including the names, email addresses and phone numbers of people registered for disaster information emails and Net119, may have been leaked. Whether any data had actually leaked or been misused had not been confirmed at the time.
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