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

MLIT and Hakuhodo: the mail server used by Hakuhodo, administrator of the Child-Rearing Eco-Home Support Project, was misused and up to 202,581 spam mails may have been sent

On March 24 MLIT announced that the mail server used by Hakuhodo, administrator of a housing support project, was misused to send spam.

Disclosed

2026-03-24

Organizations involved

2

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. The mail server used by Hakuhodo, the project administrator, was used without authorization to send spam. [1] [2]

  2. The ministry announced the spam caused by the server misuse. The number of spam mails that may have been sent was reported as 202,581. [1] [2]

Timeline

  1. Started, Detected 2026-03-20
  2. Disclosed 2026-03-24
  3. 4 days

Attack or cause

Method
[Intrusion]
Impact
Entry point
Unknown

Data exposed or at risk

–

Supply chain

Hakuhodo Inc.

[Breached]

Organizations listed on this site
2

Organizations involved

Open in organization search

Sources

  1. [1][Official]「子育てエコホーム支援事業（令和５年度補正事業）」の事務事業者が利用するサーバーの不正利用によるスパムメールについてMinistry of Land, Infrastructure, Transport and Tourism · 2026-03-24
  2. [2][News]20万2,581件のスパムメール送信の可能性 ～ 国交省「子育てエコホーム支援事業」事務事業者 博報堂が利用するメールサーバに不正アクセスScanNetSecurity · 2026-04-07 08:05