Nikkei data breach via a development cloud service
Add to my breach checkMade public · 1,830,000 records
What leaked5
Hard to replace
- Mobile number
- Home or delivery address
- Email address
Permanent
- Date of birth
- Full name
- Date of birthabout 150,000 records contain at least one of name, email, address, phone number or date of birth
- Mobile numberphone number · the notice does not say mobile or landline; about 150,000 records contain at least one of name, email, address, phone number or date of birth
- Home or delivery addressabout 150,000 records contain at least one of name, email, address, phone number or date of birth
- Email addressabout 120,000 records
- Full nameabout 150,000 records contain at least one of name, email, address, phone number or date of birth
To-dos4 · about 50 min in all
- Know the scam pattern: calls and texts that cite these leaked detailsLimits harm from: scam calls, phishing messages
- Turn on instant transaction alertsHelps you notice: scam calls
- Remove your address and phone from public profiles and tighten SNS privacyLimits harm from: visits or contact at home
- Use an authenticator app or passkey instead of SMS codesLimits harm from: SMS code theft
What happened next5 events
- UndetectedNone on record
- Response 5 eventsNo individual notice on record · show events
- RemedyNone on record
- PenaltyNone on record
- DisputesNone on record
- Nikkei National Geographic said data of some users of its services may be among the leaked data
- Nikkei: no secondary harm, such as misuse of the leaked data, confirmed as of 16 October
- Announced that about 1.83 million records had leaked from a cloud service used for system development
- Reported to the Personal Information Protection Commission
- Invalidated the stolen cloud credentials used in the attack
- Company
- Nikkei
- When it happened
- –
- Made public
- Notice
- Leak confirmed
- Affected
- 1,830,000 records · about 150,000 with personal details, about 120,000 of them with an email address; about 1.68 million identifiers only
Sources
- 日本経済新聞社 company notice (opens in a new tab)checked October 23, 2026