> JapanHacked_
[Contained][Severity: Critical][Ransomware][Credential abuse]

Tokai Software Development: ransomware leaks Tokai University data

The supplier suffered ransomware on November 7 and first disclosed it on November 13. The university's February 2026 report confirmed leakage covering 193,118 person entries after entry using stolen credentials; counting was mainly by user ID and includes duplicates. No direct intrusion into the university network was confirmed. This is separate from April's university attack.

Disclosed

2025-11-13

Organizations involved

2

Leaked or at risk

193.1K

193,118

Downtime

Unknown

Timeline

  1. Detected 2025-11-07
  2. Disclosed 2025-11-13
  3. 6 days

Attack or cause

Method
[Ransomware][Credential abuse]
Impact
[Data leak][Service outage]
Entry point
Stolen credentials

Data exposed or at risk

[Name][Gender][Date of birth][Postal address][Phone number][E-mail address][Passwords][Education][Employment][Health data][Bank account]

Supply chain

Tokai Software Development Co., Ltd.

[Breached]

Organizations listed on this site
2

Organizations involved

Open in organization search

Sources

  1. [1][News]東海ソフト開発からランサムウェア感染に関する第2報USEN ICT Solutions · 2025-11-19
  2. [2][Official]業務委託先サーバへの不正アクセスに関するお知らせと注意喚起Tokai University Educational System · 2025-11-14
  3. [3][Official]業務委託先サーバへの不正アクセスに関する調査状況と対応について（第2報）Tokai University Educational System · 2026-02-18