Skip to content
JAENES
SPossible leakOctober 4, 2026 announced

日本経済新聞社Data breach / unauthorized access incident

笹尾 祐太朗の写真Reviewed by Yutaro SasaoWritten by Leak Watch editorial team published ・ updated
Occurred on
Unconfirmed
Announced on
October 4, 2026
Severity
SCompromise of deep personal data or usable credentials.
Scale
1,646 people
Main impact
Unauthorized access to Google Workspace may have exposed names, email addresses, etc. for 1,646 people; in a separate Microsoft 365 compromise, some email bodies may also have been affected.
Information involved
Email addressFull name
Cause / key point
Cause under investigation.About Abuse of credentials
Industry
Media & entertainment
Listing / capital
Unlisted

日本経済新聞社 is not publicly listed.

Sources
Last updated
October 20, 2026
Email addressFull nameHow severity is assessed →

Is this incident worth paying attention to?

Written & reviewed

笹尾 祐太朗の写真

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

Related incidents

Browse the database →

Incidents sharing the same company, service, attack method or industry (grouped automatically from the disclosures).

Other incidents at 日本経済新聞社

Same attack method

Same industry

Attack method classification: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)

Read the Abuse of credentials guide and national trends →

← Back to Breach Watch