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JAENES
SPossible leakJune 3, 2026 announced

藤田医科大学病院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
May 25, 2026
Announced on
June 3, 2026
Severity
SCompromise of deep personal data or usable credentials.
Scale
1,365 records
Main impact
Possibly 1,365 patients' records were leaked externally from an employee's personal PC. The data include sensitive medical information such as names, dates of birth, patient IDs, diagnoses, admission/discharge dates, and test data.
Information involved
User / member IDFull nameDate of birthHealth & medical data
Cause / key point
Possible data leak caused by an employee's personal PC being remotely accessed via a support scam and unlawfully intruded upon.
Industry
Healthcare
Listing / capital
Non-profit corporation

Incident at a private university hospital

Sources
Last updated
October 20, 2026
User / member IDFull nameDate of birthHealth & 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: Under investigation / not stated(Cause not disclosed)

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