JR東海（JR東海MARKET・いいもの探訪）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- October 13, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 15,000 records
- Main impact
- Regarding approximately 15,000 email distribution records for JR東海MARKET and いいもの探訪, the contractor's investigation reported that "no fact of personal information leakage was confirmed," and this was announced.
- Information involved
- Email addressPhone numberHome addressFull name
- Cause / key point
- This was due to unauthorized access to the IDCフロンティア cloud used by the email distribution service for both sites.About Supply chain attacks (via vendors & shared services)
- Industry
- Transport & travel
- Listing / capital
- Listed company東証プライム 9022(東海旅客鉄道)
- Last updated
- October 20, 2026
Stock price reaction to the disclosure東海旅客鉄道 / 東証プライム 9022
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Written & reviewed
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 →