---
title: "Data breach at Nikkei Inc."
description: "Nikkei Inc., a Japanese business media group, stated that stolen credentials were used to access a cloud-hosted development system in the early hours of 7 October 2026. About 1.83 million records are involved; roughly 150,000 contain at least one of the following: name, email address, postal address"
canonical: https://inyourgeek.com/en/fuites-de-donnees/2026-10-16-nikkei-inc
type: fuite-de-donnees
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-10-16
dateModified: 2026-10-16
---
# Nikkei Inc.

Data breach — High

Nikkei Inc., a Japanese business media group, stated that stolen credentials were used to access a cloud-hosted development system in the early hours of 7 October 2026. About 1.83 million records are involved; roughly 150,000 contain at least one of the following: name, email address, postal address, phone number, date of birth (email address in about 120,000). The remaining ~1.68 million records contain no direct identifiers, and no payment card data is involved. As of 16 October, Nikkei reported no evidence of misuse or online disclosure; affected individuals are to be notified individually. The figure counts records, not necessarily people.

These contact details and birth dates could be used for targeted phishing messages impersonating the company.

| Fact | Value |
| --- | --- |
| Disclosed on | October 16, 2026 |
| Incident dated | October 7, 2026 |
| Sector | Media and leisure |
| Country | Japan |
| Cause | Credential stuffing |
| Severity | High |
| Status | Confirmed |

## Exposed data

- Full name
- Email address
- Postal address
- Phone number
- Date of birth

## What you can do

- Expect phishing attempts quoting your name and this company. A message that knows your details is not legitimate for that reason.
- You can ask the organisation exactly what was exposed about you (right of access), and complain to the DPA if no answer comes within a month.

## Sources

- [Nikkei discloses third data breach in a month, 1.8M records exposed](https://www.bleepingcomputer.com/news/security/nikkei-discloses-third-data-breach-in-a-month-18m-records-exposed/) — Bleeping Computer
- [More Japanese Firms Disclose Details of Data Breaches](https://www.nippon.com/en/news/yjj2026101600745/) — Nippon.com (Jiji Press)
- [NHK News Web, 16 octobre 2026](https://news.web.nhk/newsweb/na/nd-20261016de60531) — NHK

_Entry built from the cited sources after a corroboration check, then reviewed before publication._

---

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