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BLeak confirmedOctober 6, 2026 announced

長崎市（施設利用許可証等の誤送付）Data breach / unauthorized access incident

笹尾 祐太朗の写真Reviewed by Yutaro SasaoWritten by Leak Watch editorial team published ・ updated
Occurred on
June 12, 2026
Announced on
October 6, 2026
Severity
BIncidents centered on names and contact details.
Scale
1 people
Main impact
A facility use permit and related documents were mistakenly sent to another organization, resulting in the name and contact details of one person (the group's representative/person in charge) being disclosed externally.
Information involved
Full name
Cause / key point
The cause is under investigation.
Industry
Government & municipal
Listing / capital
Government / public body
Sources
Last updated
October 20, 2026
Full nameHow severity is assessed →

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Written & reviewed

笹尾 祐太朗の写真

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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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 →

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