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

Ministry of Foreign Affairs: intrusion into its external exchange network

Intruders entered the network the Ministry of Foreign Affairs uses to exchange data with outsiders; names and email addresses of about 3,600 people, mostly staff, may have leaked.

Disclosed

2026-10-30

Organizations involved

1

Leaked or at risk

3.6K

3,600

Downtime

Unknown

What happened

  1. The ministry detected unauthorized access to the network it uses to exchange data with outside parties. It is not the closed network for classified information. [1]

  2. It said personal data may have leaked. [1] [2]

Impact

Names and email addresses of about 3,600 people, mostly staff, may have leaked; about 900 of them are people outside the ministry. Consular systems such as passports and the Tabireg travel registration are not involved. No secondary damage has been found. [1] [2]

Response

The ministry blocked the access and invalidated the credentials. [1]

Timeline

  1. Detected 2026-07-27
  2. Disclosed 2026-10-30
  3. 95 days

Attack or cause

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

Data exposed or at risk

[Name][E-mail address]

Organizations involved

Sources

  1. [1][Official]不正アクセスによる個人情報の漏えいの可能性についてMinistry of Foreign Affairs · 2026-10-30
  2. [2][News]外務省 不正アクセスで個人情報約3600件漏えいの可能性NHK · 2026-10-30