SHINDO3

Japan Association of Healthcare Management Consultants

Email addresses1,051records

POSSIBLE LEAKFull name / EmployerAccount takeover · Closed (final report)

Open in the live monitor ▶
Disclosed
Jun 4, 2026
Detected
Apr 17, 2026 10:00 JST
Detection to disclosure
48 days
Leak
Leak possible
Type
Account takeover
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

ContactEmail address
IdentityName
Employment & HRAffiliation

How many

  • Email addresses 1,051 records

Who is affected

  • People the account had exchanged email with

Cause

The email account was accessed from outside and used to send spam; no virus on the device

Timeline

  1. Intrusion began
  2. Detected
  3. First disclosure

Response

  • Blocked the entry point
  • Forensic investigation
  • MFA
  • Governance / committee

Suspended the account, outside investigation and an investigation committee; two-factor authentication planned

What you should do

  1. Don't open links in emails from this company. The apology email itself may be fake
  2. You can be affected without ever using this service (parcel recipients etc.). Check any notice you receive
  3. 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