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Nippon Telenet: entrusted and customer personal data may have leaked after ransomware

A cyber-attack disruption began March 9, 2026 (disclosed March 17). The June 12 update reported no detected outbound transfer but still listed category counts that may be at risk.

Last updated: 2026-11-09

Overview

Categories: CSS entrusted ~602k, BPO ~404k, sales/partners ~33k, employees 2,044—approximate and not summed (count blank). No card data.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

  1. サイバー攻撃によるシステム障害発生について日本テレネット株式会社 · 2026-11-09
  2. サイバー攻撃によるシステム障害発生について日本テレネット株式会社 · 2026-11-09

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