SHINDO4

Q'SAI

Q'SAI Co., Ltd.

kyusai.co.jp

Mail-order customers484people

LEAK CONFIRMEDPostal address / Phone numberUnauthorized access · Investigating

Open in the live monitor ▶
Disclosed
Sep 25, 2026
Detected
Jul 13, 2026
Detection to disclosure
74 days
Leak
Leak confirmed
Type
Unauthorized access
Status
Investigating
Security spend
Measures, no amount
Compensation
Not announced
Corporate number
8010401156093

What leaked

IdentityFull name
ContactAddress, Phone number

How many

  • Mail-order customers 484 people

Who is affected

  • Customers

Cause

A cyberattack targeting Nichirei Group servers led to unauthorized external access to a system managed by the logistics contractor

Timeline

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

Response

  • Vendor review
  • Governance / committee
  • Notified individuals

Individual contact with affected people, review of security arrangements with the contractor, stronger information management

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. Check the company's notice to see if you're affected

Lessons for companies

  1. Put security requirements, audit rights and reporting deadlines in vendor contracts
  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