Japan Post announced on November 11 that TONARIWA, a contracted service used for its LINE Official Account "Post Office [Posukuma]," suffered unauthorized access, potentially leading to a data leak. The service for the account was halted, entering emergency maintenance around 2:20 PM on the same day.

TONARIWA is an operational platform for LINE Official Accounts provided by Dentsu Digital, which Japan Post used for conducting surveys and managing responses, among other things.

Dentsu Digital confirmed on November 10 that a third party had intruded using leaked authentication information for an administrative account and expanded their operational privileges, subsequently halting TONARIWA.

Across the entire service, Dentsu Digital stated that there is a possibility that authentication information used for linking with LINE Official Accounts may have been leaked, in addition to names and contact information handled by some client companies. They added that the risk of unauthorized message delivery by third parties cannot be ruled out.

Made with AI