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

Nikken Gakuin: break-in at the system for a condominium manager course; personal data of 3,597 trainees may have leaked

The system Nikken Gakuin runs for a course of the Condominium Management Center was broken into; registration numbers, birth dates and addresses of 3,597 trainees may have leaked.

Disclosed

2026-10-16

Organizations involved

2

Leaked or at risk

3.6K

3,597

Downtime

Unknown

What happened

  1. The Condominium Management Center and Nikken Gakuin disclosed it jointly. A third party had broken into the course system. [1]

Impact

3,597 trainees of the course: condominium manager registration numbers, names with readings, birth dates, addresses, phone numbers, email addresses, login IDs, trainee numbers, pass dates, course progress, results and payment status. Card and bank account data are not included. [1]

Response

Affected people are being told by email. No secondary harm has been found. [1]

Timeline

  1. Disclosed 2026-10-16
  2. 1 days

Attack or cause

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

Data exposed or at risk

[Name][Date of birth][Postal address][Phone number][E-mail address][Education]

Supply chain

Nikken Gakuin Co., Ltd.

[Breached]

Organizations listed on this site
2

Organizations involved

Open in organization search

Sources

  1. [1][Official]不正アクセスによる個人情報漏えいに関するお詫びとお知らせNikken Gakuin · 2026-10-16