SHINDO2

Central Child Consultation Center

Osaka City

Names17people

LEAK CONFIRMEDFull nameMisdelivery · Closed (final report)

Open in the live monitor ▶
Disclosed
Jun 30, 2026
Leak
Leak confirmed
Type
Misdelivery
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityFull name

How many

  • Names 17 people

Who is affected

  • Briefing participants

Cause

Insufficient checking of attachments: a document with all participants' names was sent to one person instead of an individual document

Timeline

  1. Exposure began
  2. First disclosure

Response

  • Change process

Multi-person checks for emails that contain important information

What you should do

  1. 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