NTT Docomo data breach hits up to 300,000 customers
NTT Docomo detected unauthorised access to its online shop and My docomo on 4 November 2026. The company says up to about 300,000 sets of personal data were exposed, including bank account numbers.
Key facts
- OrganisationNTT Docomo, Japan's largest mobile operator.
- What happenedDocomo detected unauthorised access to the Docomo Online Shop and My docomo on 4 November. It suspended both services early on 5 November.
- Data affectedDocomo lists names, addresses, birth dates, mobile and contact numbers. President Yoshiaki Maeda said ID document numbers, bank account numbers and plan details were also involved, and former subscribers are affected.
- Not affectedDocomo says no credit card information was compromised.
- Cause or entry pointDocomo says the cause and entry route are under investigation. Maeda declined to say whether AI agents were used.
- ResponseDocomo plans to compensate affected people and will contact them individually.
Timeline
- 4 Nov 2026Docomo detects unauthorised access to the Docomo Online Shop and My docomo. NTT Docomo
- 5 Nov 2026Docomo suspends procedures on both services from about 01:05 and says up to about 300,000 customers may be affected. NTT Docomo
- 6 Nov 2026President Yoshiaki Maeda apologises at a Tokyo press conference. He confirms bank account and ID document numbers were involved and says Docomo will pay compensation. Jiji Press via Adnkronos
Incident record
| Organisation | Date | Sector | Type | Actor | What happened | Sources |
|---|---|---|---|---|---|---|
| ✅ ConfirmedNTT Docomo | 4 Nov 2026 | Telecom | Intrusion | None | Confirmed. President Yoshiaki Maeda said unauthorized access breached up to about 300,000 sets of personal information, including names, addresses, ID document numbers and bank account numbers, and the My docomo service was suspended. | Jiji Press via Adnkronos✓ 7 Nov |
What to do
- Wait for Docomo to contact you individually. Check any message against the official docomo.ne.jp notice.
- Ignore emails, SMS or calls claiming to be Docomo that ask you to click a link or give passwords or card details.
- Call the Docomo Information Center on 151 from a Docomo phone, or 0120-800-000 from other phones (9:00 to 20:00, every day).
- Watch your bank account for unknown debits. Consumer advice is available on 188.
FAQ
How many Docomo customers were affected?
Docomo says up to about 300,000 sets of personal information, including some former subscribers.
Was my credit card data leaked?
Docomo says no credit card information was compromised. Bank account numbers and holder names were involved.
When will My docomo be back?
Docomo says the restoration date is undecided while it investigates.
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Checked 7 Nov 2026. Methodology · Data CC BY 4.0