SHINDO2

Shizuoka Prefecture

Email addresses21records

LEAK CONFIRMEDMisdelivery · Closed (final report)

Open in the live monitor ▶
Disclosed
Jan 27, 2026
Leak
Leak confirmed
Type
Misdelivery
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

ContactEmail address

How many

  • Email addresses 21 records

Who is affected

  • Neighborhood association residents
  • Prefecture staff (personal addresses)
  • Employees of the contractor and the equipment maker

Cause

A test message from the debris-flow detection system was sent with recipients' addresses visible to each other

Timeline

  1. Test message sent with recipients visible
  2. First disclosure

Response

  • Data deleted
  • Notified individuals

Apologized to resident representatives; the contractor emailed apologies to residents and asked them to delete the message

What you should do

  1. Don't open links in emails from this company. The apology email itself may be fake
  2. Expect targeted phishing posing as HR or interview contacts
  3. Check the company's notice to see if you're affected

Lessons for companies

  1. Use DLP: recipient checks, send delay, automatic attachment protection
  2. Report to the PPC: preliminary in 3–5 days, final in 30 (60 if malicious)
  3. Run red teaming and AI-assisted hardening, and publish how much you invest

Sources