NTT Docomo suspends My docomo and online shop after unauthorized server access
Published · Updated
What happened
NTT Docomo disclosed unauthorized access to its servers on 2026-11-05 and halted access to My docomo and its online shop while it investigates. Japanese reporting said the incident may involve up to about 300,000 customer information records, but Docomo had not yet confirmed the final scope.
Why it matters
A cyber incident at a top mobile operator can interrupt customer self-service, billing or SIM-related workflows, and can expose personal data usable for fraud or account takeover. If the intrusion path or affected systems extend beyond current disclosures, the case may prompt wider checks across Japan's telecom and digital identity-linked services.
NTT Docomo said it detected unauthorized access to its servers and suspended the My docomo customer portal and its online shop from the early hours of 2026-11-05. Internet Watch reported that up to about 300,000 customer records may have leaked, while the company was still investigating the scale and route of the intrusion. The event is a live cyber incident at a major Japanese telecom operator with potential implications for customer data, service continuity, and telecom-sector cyber hygiene.
Watch for
NTT Docomo disclosure on 2026-11-05 or 2026-11-06 confirming the number and data fields of affected customer records NTT Docomo notice on restoration timing for My docomo and the online shop by 2026-11-06 Personal Information Protection Commission acknowledgement of a breach report or inquiry opening by 2026-11-07 Ministry of Internal Affairs and Communications statement by 2026-11-07 on whether it requested incident reporting or preventive measures from telecom operators
Sources
- NTTドコモ、自社サーバーに不正アクセス。最大約30万件の利用者の情報流出 · internet.watch.impress.co.jp
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