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JAENES
APossible leakMay 1, 2026 announced

東北大学（サーバー・病院治験NAS）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 1, 2026
Severity
AFinancial and HR records — information that easily translates into monetary damage.
Scale
Unknown
Main impact
Unauthorized access occurred to information equipment and a NAS used for hospital clinical trial operations, and patient information may have been leaked. The number of affected records is not listed in the published materials.
Information involved
Email addressUser / member IDFull nameHealth & medical data
Cause / key point
The cause is under investigation.
Industry
Healthcare
Listing / capital
Government / public body

National University Corporation (public institution)

Sources
Last updated
October 20, 2026
Email addressUser / member IDFull nameHealth & medical dataHow 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: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)

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