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JAENES
BPossible leakAugust 17, 2026 announced

教育ソフトウェア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
April 30, 2026
Announced on
August 17, 2026
Severity
BIncidents centered on names and contact details.
Scale
4,627 records
Main impact
A ransomware attack on a dormant server may have exposed the names, affiliated universities, and partial student ID numbers of 4,627 users of the self-assessment system.
Information involved
User / member IDFull name
Cause / key point
Cause is under investigation.About Ransomware
Industry
IT & telecom
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
User / member IDFull 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

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

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