山形県（技能検定合格証書等の誤送付）Data breach / unauthorized access incident
- Occurred on
- October 7, 2026
- Announced on
- October 16, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 7 people
- Main impact
- 山形県 mistakenly sent skill test certificates and related documents to another supervising organization, publicly disclosing personal information for 7 technical intern trainees including names, dates of birth, technician numbers, and exam grades; documents for one additional person were recovered and no leak occurred for that individual.
- Information involved
- User / member IDFull nameDate of birth
- Cause / key point
- Attributed to human and procedural error from mis-sending documents; details are under investigation.
- Industry
- Government & municipal
- Listing / capital
- Government / public body
Prefectural skill examination affairs
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
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CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.
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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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Attack method classification: Misdirected sending & disclosure (human error)(Leaks caused by wrong recipients or exposure settings)
Read the Misdirected sending & disclosure (human error) guide and national trends →