> JapanHacked_
[Investigating][Severity: Moderate][Intrusion]

Accretive: unauthorized access to its servers caused a system outage and also affected its client Japan Shooter

Unauthorized access hit the network of this provider of services to medical and nursing care operators and caused a system outage that also affected its client Japan Shooter.

Disclosed

2025-08-25

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. Early in the morning a security vendor contacted it, and it found a system outage caused by unauthorized access to its servers and announced it. [2]

  2. It issued a second report. [1] [3]

  3. Japan Shooter, which had outsourced invoice system entry to the company, announced a possible information leak through its contractor's unauthorized access. [4]

Impact

The company's systems were disrupted. The coverage of the second report mentions a setting mistake during a firewall update. Japan Shooter announced a possible information leak via its contractor. The coverage consulted gives no count or content of leaked data. [3] [4]

Timeline

  1. Disclosed 2025-08-25
  2. 1 days

Attack or cause

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

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]当社ネットワークへの不正アクセスによるシステム障害について（第二報）Accretive Co., Ltd. · 2025-08-29
  2. [2][News]アクリーティブのネットワークに不正アクセス、システム障害発生ScanNetSecurity · 2025-09-05 08:05
  3. [3][News]ファイアウォール更新作業時 設定ミス ～ アクリーティブのネットワークに不正アクセスScanNetSecurity · 2025-09-10 08:05
  4. [4][News]請求書のシステム登録を委託していた日本シューターも影響 ～ アクリーティブのネットワークへの不正アクセスScanNetSecurity · 2025-09-22 08:05