長崎市（集団健診予約者名簿の残置）Data breach / unauthorized access incident
- Occurred on
- July 2, 2026
- Announced on
- October 6, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 69 people
- Main impact
- A contractor left the appointment list at the venue after mass health screenings, leaving names, dates of birth, addresses, etc. of 69 people accessible to third parties.
- Information involved
- Home addressFull nameDate of birth
- Cause / key point
- Cause is under investigation.About Supply chain attacks (via vendors & shared services)
- Industry
- Government & municipal
- Listing / capital
- Government / public body
長崎市 (municipality)
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
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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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Other incidents at 長崎市
Same attack method
- S第一興商（ビッグエコー等）2026.10.08 announced・Affected 8,631,000 records
- A旭化成セラピューティクス（Pharma DIGITAL）2026.10.06 announced・Affected 514,000 people
- A大和証券2026.10.05 announced・Affected 220,000 records
- CTOPPAN（損保ジャパン）2026.09.29 announced・Affected 177,426 people
- A大東ガス株式会社2026.09.28 announced・Affected 124,000 records
- A大阪大学2026.10.21 announced・Affected 77,851 people
Same industry
- S市立岸和田市民病院（患者書類）2026.10.16 announced・Affected 1 people
- S大崎地域広域行政事務組合消防本部（NET119・119RAIDEN）2026.10.14 announced・Affected 45 people
- S神奈川県警（使用済み運転免許証）2026.10.09 announced・Affected 30 records
- S長崎市（マイナンバーカード特急発行書類の紛失）2026.09.08 announced・Affected 4 people
- S村田製作所2026.04.27 announced・Affected 73,000 records
- S静岡市2026.01.30 announced・Affected 3,950 people
Attack method classification: Supply chain attacks (via vendors & shared services)(Compromising the provider instead of the user)
Read the Supply chain attacks (via vendors & shared services) guide and national trends →