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Dentsu Digital announced on Nov 11 that an admin account used in the infrastructure of its TONARIWA marketing platform was accessed by a third party after its credentials leaked, with privileges escalated, and the service was suspended .
According to ITmedia, Iris Plaza announced on November 5 that following unauthorized access to an external cloud service used by the company, personal data of approximately 7.
PayCloud Holdings subsidiary Arara said its email delivery service Arara Message suffered unauthorized access; it first disclosed the incident on Oct 29, and its Nov 6 third report put the deduplicated number of taken (or possibly taken) email addresses at 81,329,467 .
Japanese cloud and hosting provider Sakura Internet said in its third report on September 10 that it detected an anomaly on a maintenance server for its rental server service on August 9, and found unauthorized access to rental servers with malware planted, affecting 951 accounts .
SYLA Holdings Co.
The Japanese crowdfunding platform CAMPFIRE said on 24 April 2026 that personal data may have leaked from part of the systems that manage customer information, affecting 225,846 unique users, and that credit-card data is not included .
According to Security NEXT, Mynavi subsidiary 444 announced that a development server for its TechFUL service was breached in December 2024, potentially exposing personal information of contractors and users .