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

Digital Agency: unauthorized access to the Government Solution Service

On 11 September, the Digital Agency said its Government Solution Service (GSS), the shared platform used by ministries, had been accessed and files containing personal data may have leaked. On 25 June it detected mass file access through a maintenance operator's account, and on 9 July found that an outsider had got in by exploiting a VPN device vulnerability. The vulnerability was already public and was exploited before the patch was applied. About 246,000 records of ministry staff and contractors, with names, emails, phone numbers and addresses, may be affected; no members of the public or My Number data were included. Government work was not disrupted.

Disclosed

2026-09-11

Organizations involved

1

Leaked or at risk

246K

246,000

Downtime

Unknown

Timeline

  1. Detected 2026-06-25
  2. Disclosed 2026-09-11
  3. 78 days

Organizations involved

Open in organization search

Sources

  1. [1][Official]ガバメントソリューションサービスへの不正アクセスによる職員等の個人情報の漏えいの可能性についてDigital Agency · 2026-09-11
  2. [2][Official]「ガバメントソリューションサービスへの不正アクセスによる職員等の個人情報の漏えいの可能性について」に関するQ&ADigital Agency · 2026-09-12
  3. [3][News]保守運用担当者のアカウント利用したファイル接続を検知…政府の共通基盤ネット「GSS」にサイバー攻撃The Yomiuri Shimbun · 2026-09-11