GMOトラスト・ログイン（クラウドストレージ）Data breach / unauthorized access incident
- Occurred on
- November 1, 2017
- Announced on
- September 16, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 37,747 people
- Main impact
- Since November 2017, files containing information for 2,007 companies and 37,747 individuals (provisional) were obtained by third parties due to a configuration error. Most records were email addresses; some included billing recipient names, addresses, phone numbers, etc.
- Information involved
- Email addressPhone numberHome addressFull name
- Cause / key point
- Misconfiguration and design flaws of cloud storage.
- Industry
- IT & telecom
- Listing / capital
- UnlistedParent company: GMOグローバルサイン・ホールディングス(東証プライム 3788)
GMOトラスト・ログイン is a subsidiary of GMOグローバルサインHD.
- Last updated
- October 20, 2026
Stock price reaction to the disclosureGMOグローバルサイン・ホールディングス・親会社 / 東証プライム 3788
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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: Misconfiguration & access-control gaps(Data left readable by anyone)
Read the Misconfiguration & access-control gaps guide and national trends →