JR九州Data breach / unauthorized access incident
- Occurred on
- January 1, 2022
- Announced on
- November 4, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 13,000 records
- Main impact
- The names and email addresses of up to 13,000 customers who requested materials for condominium sales may have been leaked. Addresses and phone numbers are not believed to have been exposed.
- Information involved
- Email addressFull name
- Cause / key point
- A possible information leak caused by unauthorized third-party access to the system of a subsidiary that handles email distribution.
- Industry
- Real estate
- Listing / capital
- Listed company9142
- Sources
- Last updated
- November 5, 2026
Stock price reaction to the disclosureJR九州 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: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)
Read the Unauthorized access (method undisclosed) guide and national trends →