SHINDO2

Tokyo Metropolitan Government

Applicants20people

LEAK UNCLEAREmail address / Full nameUnauthorized access · Closed (final report)

Open in the live monitor ▶
Disclosed
Jul 8, 2026
Leak
Unknown
Type
Unauthorized access
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

ContactEmail address
IdentityEncrypted names

How many

  • Applicants 20 people

Who is affected

  • Seminar applicants

Cause

The seminar sign-up site's server was attacked from outside; the website, admin screen and applicant data were temporarily wiped

Timeline

  1. First disclosure

What you should do

  1. Don't open links in emails from this company. The apology email itself may be fake
  2. 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