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JAENES
CPartial leak confirmedOctober 23, 2026 announced

鹿児島音楽文化協会（鹿児島音協メルマガ登録サイト・mail magazine ON&OFF）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 23, 2026
Severity
CLimited data such as email addresses and identifiers.
Scale
Unknown
Main impact
It was reported that due to unauthorized third‑party access to the ブラストメール servers used for delivery, some newsletter subscriber information managed by the association was leaked externally. The scale of the leak and the items exposed have not been disclosed.
Information involved
Not specified in the disclosure
Cause / key point
Server compromise from unauthorized external access (unauthorized access to the contracted delivery service "ブラストメール").About Supply chain attacks (via vendors & shared services)
Industry
Media & entertainment
Listing / capital
Non-profit corporation
Sources
Last updated
October 25, 2026

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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: 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 →

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