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JAENES
ALeak confirmedMarch 31, 2026 announced

消費者庁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
January 27, 2026
Announced on
March 31, 2026
Severity
AFinancial and HR records — information that easily translates into monetary damage.
Scale
8 people
Main impact
Erroneously sent the names, dates of birth, Individual Numbers, and salary payment amounts etc. of 8 staff members to another municipality, and carried out invalidation procedures etc. via el-tax.
Information involved
Identity verification dataFull nameDate of birth
Cause / key point
Misdelivery of salary payment reports caused by a transcription error in residence information.
Industry
Government & municipal
Listing / capital
Government / public body
Sources
Last updated
October 20, 2026
Identity verification dataFull nameDate of birthHow 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: Misdirected sending & disclosure (human error)(Leaks caused by wrong recipients or exposure settings)

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