株式会社teket（電子チケットサービス teket）Data breach / unauthorized access incident
- Occurred on
- November 5, 2026
- Announced on
- November 8, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- Unknown
- Main impact
- Unauthorized access to teket's member information management system resulted in the leakage of customer data including all members' names and email addresses. Service suspension also halted organizers' ticket sales and entry reception functions, so the impact extended to organizers.
- Information involved
- Full nameEmail addressDate of birthPhone numberHome addressAuth token
- Cause / key point
- It is believed a third party illegally accessed the system that manages member information and related data; the detailed intrusion route has not been disclosed.
- Industry
- Services & other
- Listing / capital
- Unlisted
- Last updated
- November 9, 2026
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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 →