Skip to content
JAENES
CPossible leakMarch 3, 2026 announced

金原出版株式会社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
July 31, 2024
Announced on
March 3, 2026
Severity
CLimited data such as email addresses and identifiers.
Scale
160 records
Main impact
A test file was published in the production environment, making 160 email addresses and nicknames externally viewable, and 7 external accesses have been confirmed.
Information involved
Email address
Cause / key point
A configuration error caused the test file to be published in the production environment.
Industry
Media & entertainment
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Email addressHow 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).

Same attack method

Same industry

Attack method classification: Misconfiguration & access-control gaps(Data left readable by anyone)

Read the Misconfiguration & access-control gaps guide and national trends →

← Back to Breach Watch