The Ministry of Foreign Affairs said on 30 October that about 3,600 items of staff personal data, such as names and e-mail addresses, may have leaked through unauthorised access. It said no highly sensitive information or passport data was involved and no secondary harm has been confirmed so far. The disclosure adds a central ministry to the run of large private-sector breaches; the intrusion route and remedial measures have yet to be set out.
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AI & Security Observatory（2026-10-30）「外務省、不正アクセスで職員の個人情報約3,600件が漏えいした可能性と発表 機密情報と旅券情報は対象外」『AI & Security Observatory』、第1.0版、最終更新2026-11-01。https://ai-security-observatory.org/ja/brief/brief-20261101-12/
AI & Security Observatory (2026-10-30). Japan's Foreign Ministry says about 3,600 staff records may have leaked in an unauthorised access, with no classified or passport data involved . AI & Security Observatory, version 1.0. Updated 2026-11-01. https://ai-security-observatory.org/en/brief/brief-20261101-12/
Version 1.0 · Publication date 30 Oct 2026 · Updated 1 Nov 2026
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