SHINDO2

Kaigetsukan Group

Unauthorized accessSize not disclosed

POSSIBLE LEAKFull name / Phone numberContained

Open in the live monitor ▶
Disclosed
Aug 3, 2026
Leak
Leak possible
Type
Unauthorized access
Status
Contained
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityNames and contact details
ContactNames and contact details

Not leaked

  • There is no possibility that stay details or credit card numbers were leaked
  • There is no possibility that stay details or credit card numbers were leaked

Who is affected

  • Guests of the lodging facilities

Cause

Unauthorized third-party access to the lodging facilities' systems (details not disclosed)

Timeline

  1. Intrusion began
  2. Intrusion stopped
  3. First disclosure

Response

  • Blocked the entry point
  • Forensic investigation
  • More monitoring

Blocked the access immediately after discovery; investigating cause and scope with a specialist firm; strengthening security

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. 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