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JAENES
BLeak confirmedApril 6, 2026 announced

リゾナスフェイスクリニック東京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
April 6, 2026
Severity
BIncidents centered on names and contact details.
Scale
369 people
Main impact
We have confirmed that personal information of 369 patients was unlawfully obtained due to a ransomware attack on a cloud server.
Information involved
Not specified in the disclosure
Cause / key point
Unauthorized acquisition occurred due to a ransomware attack on a cloud server.About Ransomware
Industry
Healthcare
Listing / capital
Non-profit corporation

Private medical institution (clinic)

Sources
Last updated
October 20, 2026
How 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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