> JapanHacked_
[Investigating][Severity: Moderate][Intrusion]

Youji Katsudo Kenkyukai: break-in at its company network; effect on data under investigation

The network of Youji Katsudo Kenkyukai, which teaches physical education at kindergartens, was broken into. No leak of personal or partner data had been found at disclosure.

Disclosed

2026-10-20

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. Traces of suspicious access were found on the company network and an investigation began. Unauthorized access by a third party was confirmed. [1]

  2. Disclosed in a stock exchange filing. [1]

Impact

The entry path and scope are still being investigated. The company is checking personal and business partner data, but has found nothing showing a leak. There is no major effect on its business or services. [1]

Response

The affected systems were isolated and accounts that may have been misused were disabled. Monitoring has been stepped up. [1]

Timeline

  1. Detected 2026-10-14
  2. Disclosed 2026-10-20
  3. 6 days

Attack or cause

Method
[Intrusion]
Impact
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]当社ネットワークへの不正アクセスに関するお知らせYouji Katsudo Kenkyukai · 2026-10-20 12:30