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[Investigating][Severity: Major][Intrusion]

TechnoHill: cyberattack on 1FEdu, a radiation exposure training site run for the health ministry, leaked 6 learners' passwords and led to unauthorized logins

The 1FEdu training site for Fukushima Daiichi workers was attacked; 6 email and password pairs leaked, and data of up to 595 learners may have leaked.

Disclosed

2026-10-22

Organizations involved

2

Leaked or at risk

595

595

Downtime

Unknown

What happened

TechnoHill, which runs the 1FEdu training site on reducing radiation exposure at Fukushima Daiichi, reported a cyberattack on the site to the health ministry. The service was stopped and outside access blocked. [1]

Impact

Leaks of 6 email and password pairs were confirmed, and they were used to log in. The same database held the names (with readings), age groups, genders, employers, positions, job types, email addresses, passwords, phone numbers and years of experience at Fukushima Daiichi of up to 595 learners, which may also have leaked. [1]

Passwords are assigned by the system and cannot be changed by users, so the ministry considers reuse elsewhere unlikely. No misuse had been found at the time of disclosure. [1]

Response

The ministry instructed the contractor to find the cause and prevent a recurrence, and affected people are to be contacted individually. [1]

Timeline

  1. Disclosed 2026-10-22
  2. 1 days

Supply chain

Services hit

Organizations involved

Open in organization search

Sources

  1. [1][Official]委託事業に係る個人情報の漏えいについてMHLW · 2026-10-22