日本航空Data breach / unauthorized access incident
- Occurred on
- August 10, 2023
- Announced on
- October 28, 2026
- Severity
- SCompromise of deep personal data or usable credentials.
- Scale
- 92,000 records
- Main impact
- Unauthorized access to アマデウス社's cloud passenger management system resulted in the improper viewing of approximately 92,000 reservation records, of which about 2,000 also had passport numbers and contact details accessed. The company announced that no improper use of the information has been confirmed.
- Information involved
- Full namePhone numberIdentity verification data
- Cause / key point
- Publicly reported as an information leak caused by unauthorized access to the cloud passenger management system of スペイン・アマデウス社.
- Industry
- Transport & travel
- Listing / capital
- Listed company東証プライム 9201
- Sources
- Last updated
- October 29, 2026
Stock price reaction to the disclosure日本航空 / 東証プライム 9201
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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 →