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JAENES
SPossible leakSeptember 15, 2026 announced

あいの風とやま鉄道株式会社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
September 2, 2026
Announced on
September 15, 2026
Severity
SCompromise of deep personal data or usable credentials.
Scale
1,409 people
Main impact
Unauthorized access to the reservation site resulted in cancellations and registrations outside normal procedures, and it has been reported that 1,409 reservations may have been affected.
Information involved
Email addressPhone numberHome addressFull name
Cause / key point
Cause is under investigation.
Industry
Transport & travel
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Email addressPhone numberHome addressFull nameHow 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: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)

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