Nikkei
Tokyo, Japan3 sources
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 1 Nov 2026.
Nikkei Inc. discloses third data breach affecting 1.83 million records
Nikkei Inc. disclosed a data breach affecting 1.83 million personal information records, marking its third breach in about a month. The breach involved a cloud service used for system development.
- Type
- Data breach
- Sector
- Media
- Records
- 1.8M records confirmed
- First reported
- 1 Nov 2026
- Latest source
- 1 Nov 2026
What to do
- If you have an account, change that password, and anywhere you reused it.
- Turn on two-factor authentication, ideally an authenticator app or passkey, not SMS.
- Expect phishing that uses your real details. Do not click links in messages about this incident; go to the company's site directly.
- If payment cards were involved, watch statements and ask your bank for a new card.
- If government ID or social security numbers were involved, consider a credit freeze.
- If this is a vendor of yours, ask what of your data they held and whether it was in scope.
- Reset any API keys, SSO trusts or shared credentials you have with them.
- Brief your help desk: attackers often impersonate the breached brand next.
Not sure? Ask an assistant with the sources attached, or have a coding agent check your systems.
Check your systems for Nikkei