SHINDO3

Kimitsu City

Insider misuseSize not disclosed

LEAK UNCLEARPassword / HR / labour recordsClosed (final report)

Open in the live monitor ▶
Disclosed
Jul 21, 2026
Leak
Unknown
Type
Insider misuse
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

Employment & HRPersonnel-related information
CredentialsAnother employee's ID and password

Who is affected

  • City employees

Cause

A firefighter used another employee's ID and password to access the city's internal system, trying to find personnel transfer information

Timeline

  1. Unauthorized access in early March; found when the account locked after wrong password attempts
  2. First disclosure

What you should do

  1. Change this password and every account that reused it now. Switch to a passkey where offered
  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. Passkeys or MFA for every account; monitor leaked credentials and rotate API keys
  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