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 following subcontractor breach
↳ Knock-on damage from the Arara incident · View original incidentImpact: Possible personal information leak
Unauthorised access took place between 28 and 31 October 2026 on arara message, a service run 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 are still being investigated. In a follow-up notice on 10 November, the city said it had moved to a new email infrastructure and resumed sending appointment confirmation emails.
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