日本経済新聞社(日経)Data breach / unauthorized access incident
- Occurred on
- October 7, 2026
- Announced on
- October 16, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 1,830,000 records
- Main impact
- Personal information of 約183万件 stored on a cloud service for system development was leaked; records contained one or more of name, email address, address, phone number, or date of birth.
- Information involved
- Email addressUser / member IDAuth tokenPhone numberHome addressFull nameDate of birth
- Cause / key point
- Access credentials for the development cloud were stolen by some means, and it was subject to unauthorized access from the early hours to the morning of 10月7日.About Abuse of credentials
- Industry
- Media & entertainment
- Listing / capital
- Unlisted
日本経済新聞社 is unlisted.
- Sources
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
Written & reviewed
Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.
CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.
Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:
Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction
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Attack method classification: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)
Read the Abuse of credentials guide and national trends →