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[Resolved][Severity: Moderate][Unknown]

MC Retail Energy: a cyberattack on a server managed by an outsourcee suspended applications and rate simulation for its Machi-ene service

A server managed by an outsourcee saw abnormal mass access and was shut down, suspending Machi-ene applications and rate simulation until resumption on February 16.

Disclosed

2026-01-30

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. It detected unusual mass access on a server managed by an outsourcee, judged it a cyberattack and stopped the server. Machi-ene applications and rate simulation were suspended. [1]

  2. Machi-ene applications and rate simulation resumed. [2]

Impact

Only applications and rate simulation were stopped, with no effect on other services. The server held no personal information, and no leak has been confirmed. [1]

Timeline

  1. Started, Detected, Disclosed 2026-01-30
  2. 1 days

Attack or cause

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

Data exposed or at risk

–

Supply chain

[Breached]

Organizations listed on this site
1

Organizations involved

Open in organization search

Sources

  1. [1][Official]サイバー攻撃によるシステム障害発生(2026年１月30日)のお知らせMC Retail Energy Co., Ltd. · 2026-01-30
  2. [2][News]外部委託先が管理するサーバで大量のアクセスを検知、「まちエネ」の申込み・料金シミュレーションを一時停止 2/16 再開ScanNetSecurity · 2026-02-19 08:05