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JAENES
SLeak confirmedMay 12, 2026 announced

東山産業株式会社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
Unconfirmed
Announced on
May 12, 2026
Severity
SCompromise of deep personal data or usable credentials.
Scale
Unknown
Main impact
A ransomware incident was confirmed; after administrator privileges were obtained the impact spread within the network, and the company announced that data observed externally included its information. Details of the scope of the leak are not described in the public materials.
Information involved
Phone numberHome addressFull name
Cause / key point
The cause is under investigation.About Ransomware
Industry
Manufacturing
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Phone numberHome addressFull nameHow severity is assessed →

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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

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Attack method classification: Ransomware(Encrypting data and demanding a ransom)

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