SHINDO3

Tsurumi Ward, Yokohama

Yokohama City

LossSize not disclosed

POSSIBLE LEAKID document (type not stated) images / Postal addressClosed (final report)

Open in the live monitor ▶
Disclosed
May 12, 2026
Leak
Leak possible
Type
Loss
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityName
ID documentsSeal impressions (image)
ContactAddress (person who confirmed the box was empty)

Who is affected

  • Polling officials and witnesses
  • Proxy voters and the person who confirmed the ballot box was empty

Cause

The polling-station record went missing

Timeline

  1. Record made on election day
  2. First disclosure

Response

  • Notified individuals

Contacted officials and witnesses; proxy voters and others can be identified only from the lost record, so they cannot be contacted

What you should do

  1. ID numbers can never be changed. Request your credit file from CIC, JICC and others and look for contracts or loans you didn't make
  2. Register a self-declaration (honnin shinkoku) with the credit bureaus so lenders check applications in your name more carefully. The stronger loan self-restriction scheme also blocks your own borrowing and can't be withdrawn for 3 months. Neither stops bank accounts being opened
  3. Watch for unexpected mail or invoices; your address is hard to change
  4. Expect targeted phishing posing as HR or interview contacts
  5. Check the company's notice to see if you're affected

Lessons for companies

  1. Don't keep ID or bank data: delete after checks or use a KYC provider
  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