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BLeak confirmedOctober 9, 2026 announced

大阪市北区（住民票）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
Unconfirmed
Announced on
October 9, 2026
Severity
BIncidents centered on names and contact details.
Scale
2 people
Main impact
Due to misassignment of マイナンバー etc., the resident record was written incorrectly and information for two people was mistakenly issued.
Information involved
Identity verification data
Cause / key point
The cause is under investigation.
Industry
Government & municipal
Listing / capital
Government / public body

Incident related to a municipality's public administrative duties.

Sources
Last updated
October 20, 2026
Identity verification dataHow severity is assessed →

Is this incident worth paying attention to?

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: Under investigation / not stated(Cause not disclosed)

Read the Under investigation / not stated guide and national trends →

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