埼玉大学（特許管理システム KEMPOS / 委託先：株式会社ネットワークス）Data breach / unauthorized access incident
- Occurred on
- February 1, 2025
- Announced on
- March 30, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 1,516 people
- Main impact
- A server of the patent management system managed by the contractor may have been externally accessible due to unauthorized access, and the names, affiliated organization names, addresses, etc., of a total of 1,516 people — including inventors and representative patent attorneys — may have been affected.
- Information involved
- Full nameHome address
- Cause / key point
- Unauthorized access to a server managed by the contractor (an incident in which mining malware was observed running and traces of ransomware infection were found).About Ransomware
- Industry
- Education
- Listing / capital
- Government / public body
- Sources
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
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: Ransomware(Encrypting data and demanding a ransom)
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