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[Investigating][Severity: Critical][Intrusion]

Oyatsu Company: unauthorized access

Unauthorized access caused a system failure on March 3. The company investigated possible exposure of names, addresses and phone numbers for about 170,000 campaign winners and attendance-related information for 450 employees. Its notice did not confirm external leakage or secondary harm.

Disclosed

2025-03-12

Organizations involved

1

Leaked or at risk

170K

170,000

Downtime

Unknown

Timeline

  1. Detected 2025-03-03
  2. Disclosed 2025-03-12
  3. 9 days

Attack or cause

Method
[Intrusion]
Impact
[Data leak][Service outage]
Entry point
Unknown

Data exposed or at risk

[Name][Postal address][Phone number][Employment]

Organizations involved

Open in organization search

Sources

  1. [1][Official]不正アクセスによるシステム障害発生についてのお詫びとお知らせThe Oyatsu Company, Ltd. · 2025-03-12