JR九州グループData breach / unauthorized access incident
- Occurred on
- October 17, 2025
- Announced on
- January 19, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 14,638 people
- Main impact
- Names, company names, work emails, PC login IDs, etc. of 14,638 current and former employees may have been exposed.
- Information involved
- Email addressUser / member IDFull name
- Cause / key point
- Cause is under investigation.
- Industry
- Transport & travel
- Listing / capital
- UnlistedParent company: 九州旅客鉄道(東証プライム 9142)
Incident involving JR九州グループ
- Last updated
- October 20, 2026
Stock price reaction to the disclosure九州旅客鉄道・親会社 / 東証プライム 9142
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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: Under investigation / not stated(Cause not disclosed)
Read the Under investigation / not stated guide and national trends →