近鉄グループホールディングスData breach / unauthorized access incident
- Occurred on
- October 30, 2026
- Announced on
- October 31, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 2,678 people
- Main impact
- The names and purchase amounts of 2,678 investors who bought 1,000,000 yen or more of the 135th unsecured corporate bonds may have been leaked due to unauthorized access to an external service. Authentication credentials for financial transactions are said not to be included.
- Information involved
- Full name
- Cause / key point
- Unauthorized access by a third party to the SaaS-based "デジタル証券プラットフォーム" provided by an NTTデータ subcontractor (unauthorized access to an external service).About Abuse of credentials
- Industry
- Finance & insurance
- Listing / capital
- Listed company
- Last updated
- November 2, 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
Related incidents
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Other incidents at 近鉄グループ
Incidents related to "デジタル"
Incidents where the damage spread through the same service or system.
- A楽天証券2026.10.31 announced・Affected 362 records
- Bデジタル庁（ホームページ問い合わせフォーム、運営の一部委託先: Studio）2026.10.22 announced・Affected 13,358 records
- SStudio（クラウド環境）2026.10.16 announced・Affected Unknown
- B大阪市デジタル統括室（メール）2026.10.09 announced・Affected 3 people
- Bデジタル庁2026.09.11 announced・Affected 246,000 people
- Dデジタル庁（国家資格システム）2026.08.07 announced・Affected 150 people
Incidents related to "ntt"
Incidents where the damage spread through the same service or system.
Same attack method
- A日本経済新聞社(日経)2026.10.16 announced・Affected 1,830,000 records
- Sチャーム本店2026.09.01 announced・Affected 370,000 records
- ACAMPFIRE2026.06.02 announced・Affected 225,846 accounts
- Aウエーブ（Webアップロード）2026.04.01 announced・Affected 176,810 records
- Aシチズン時計（問い合わせ管理）2026.10.06 announced・Affected 100,000 people
- Bイノベーション（GitHub）2026.08.07 announced・Affected 62,689 people
Same industry
- Sアフラック生命保険2026.06.30 announced・Affected 4,400,000 people
- SCSアカウンティング株式会社2026.05.15 announced・Affected Unknown
- Sマネーフォワード（GitHub）2026.05.01 announced・Affected 370 records
- Aライフカード2026.10.28 announced・Affected 339,610 records
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- AFivot（IDARE）2026.10.13 announced・Affected 129,659 people
Attack method classification: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)
Read the Abuse of credentials guide and national trends →