SHINDO4

Daiichi Life

Daiichi Life Insurance Co., Ltd.

Personal data~120,000people

POSSIBLE LEAKPostal address / Phone numberUnauthorized access · Investigating

Open in the live monitor ▶
Disclosed
Oct 2, 2026
Detected
Sep 24, 2026
Detection to disclosure
8 days
Leak
Leak possible
Type
Unauthorized access
Status
Investigating
Security spend
Not checked yet
Compensation
Not announced
Corporate number
1010001174683

What leaked

Employment & HREmployee number, Department, Position (grade), Job duties, Name of department head
IdentityFull name, Gender
ContactAddress, Phone number

How many

  • Current and former employees ~120,000 people
  • Current employees ~50,000 people
  • Former employees ~70,000 people

Who is affected

  • Employees
  • Former employees
  • Seconded employees

Cause

Unauthorized access by a third party to the HR system (details of the cause not disclosed)

Timeline

  1. Detected
  2. First disclosure
  3. Company issued an update

What you should do

  1. Treat refund or apology calls and texts as scams. Call back only on the number from the official site
  2. Watch for unexpected mail or invoices; your address is hard to change
  3. Expect targeted phishing posing as HR or interview contacts
  4. 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