SHINDO2

Miyakonojo City

LossSize not disclosed

POSSIBLE LEAKClosed (final report)

Open in the live monitor ▶
Disclosed
Mar 20, 2026
Detected
Mar 13, 2026
Detection to disclosure
7 days
Leak
Leak possible
Type
Loss
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

UnspecifiedPupils' first-term grades

Who is affected

  • Pupils at a city elementary school

Cause

An official USB stick kept in a desk drawer in the staff room or classroom went missing

Timeline

  1. Loss found when the teacher reported it to management
  2. Briefing held for parents
  3. First disclosure

Response

  • Change process

Collected all teachers' USB sticks and banned their use; data will be kept on school PCs or the board of education's Google Drive

What you should do

  1. Check the company's notice to see if you're affected

Lessons for companies

  1. Report to the PPC: preliminary in 3–5 days, final in 30 (60 if malicious)
  2. Run red teaming and AI-assisted hardening, and publish how much you invest

Sources