日本エネルギー経済研究所Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- October 2, 2026
- Severity
- SCompromise of deep personal data or usable credentials.
- Scale
- 13 records
- Main impact
- Confirmed leakage of 13 passport records. There is a risk that 759 emails were also leaked; among those, several are reported to include 5 items such as account holder names and account numbers.
- Information involved
- Email addressCard & payment dataIdentity verification dataPhone numberFull name
- Cause / key point
- Unauthorized access to the Microsoft 365 accounts of 6 staff members via a phishing attack.About Targeted email & phishing
- Industry
- Education
- Listing / capital
- Non-profit corporation
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
Written & reviewed
Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.
CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.
Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:
Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction
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- Sちとせグループ（ちとせアカデミー）2026.10.09 announced・Affected 843 people
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Attack method classification: Targeted email & phishing(Fake emails and sites that steal credentials)
Read the Targeted email & phishing guide and national trends →