> JapanHacked_
[Resolved][Severity: Moderate][Credential abuse]

CS Accounting: unauthorized access to its servers

Early on 5 May, the EDR at CS Accounting, which provides accounting and HR outsourcing and cloud services, detected suspicious behavior on some servers, which were isolated. A system account had been taken over by a password brute-force attack from overseas IP addresses and used to log on to some servers. Servers for its cloud services were not entered, and no leak of personal or confidential data was found.

Disclosed

2026-05-15

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-05-05
  2. Disclosed 2026-05-15
  3. 10 days

Attack or cause

Method
[Credential abuse]
Impact
Entry point
Stolen credentials

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]【重要】弊社サーバーにおける不正アクセスに関する最終報告CS Accounting · 2026-05-15