株式会社チームスピリット（TeamSpirit）Data breach / unauthorized access incident
- Occurred on
- October 27, 2026
- Announced on
- November 6, 2026
- Severity
- SCompromise of deep personal data or usable credentials.
- Scale
- 28,824 records
- Main impact
- Unauthorized access to a development server resulted in the leakage of personal information of customer contacts, users, inquirers, employees, etc.; 28,824 records confirmed after deduplication. The company reports this includes 35 items of sensitive personal information.
- Information involved
- Email addressUser / member IDAuth tokenFull nameDate of birth
- Cause / key point
- A third party obtained data by illegally logging in due to misconfiguration and inadequate information management of the server operated for our development use.About Abuse of credentials
- Industry
- IT & telecom
- Sources
- Last updated
- November 7, 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: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)
Read the Abuse of credentials guide and national trends →