City of Honjo security incident history
Hacking, data breaches and other security incidents involving City of Honjo, with related coverage.
Incidents: 1 · Most recent
Honjo warns of possible card appointment data leak after subcontractor breach
↳ Knock-on damage from the Arara incident · View original incidentImpact: Possible personal information leak
Unauthorized access occurred between October 28 and 31, 2026, on arara message, a service operated by arara, to which TKC, the contractor for Honjo’s My Number Card issuance appointment and management system, had subcontracted email delivery. Registered email addresses, names, and other information may have been leaked, and whether any Honjo-related information was leaked and the extent of any such leak remain under investigation. In a follow-up notice on November 10, the city said it had switched to a new email infrastructure and resumed sending appointment confirmation emails.
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