[Contained][Severity: Critical][Intrusion]

Tohoku University: intrusion into university servers and Tohoku University Hospital NAS

The university confirmed server intrusion April 16 and possible exposure of patient data on a hospital clinical-trial NAS April 23, disclosing the incident May 1. A faculty PC was abused; passwords were reset and network segments isolated. A June 17 addition notified former patients and trial physicians and reported retirement of the NAS. Other medical systems were unaffected as far as confirmed; care and trials continued.

Disclosed

2026-05-01

Organizations involved

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

Detected 2026-04-16
Disclosed 2026-05-01
15 days

Attack or cause

Method: [Intrusion]
Impact: [Data leak]
Entry point: Unknown

Data exposed or at risk

[Name][Gender][E-mail address][Health data]

Organizations involved

[Breached][Critical]Miyagi, Sendai, AobaEducation and learning support
Tohoku University
[Breached][Critical]Miyagi, Sendai, AobaMedical care and welfare
Tohoku University Hospital

						Note
Tohoku University	[Breached]	[Critical]	Miyagi, Sendai, Aoba	Education and learning support	Unknown
Tohoku University Hospital	[Breached]	[Critical]	Miyagi, Sendai, Aoba	Medical care and welfare	Unknown

Open in organization search

Sources

[1][Official]本学への不正アクセスについてのご報告とお詫び（6/17追記）Tohoku University Hospital · 2026-06-17