マツダ（CLUB MAZDA COMMUNITY）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- October 14, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 4,103 people
- Main impact
- It was disclosed that data for up to 4,103 members and operational staff of CLUB MAZDA COMMUNITY — including email addresses and purchase/usage history — may have been viewed or obtained. The incident is attributed to unauthorized access to the vendor Commune.
- Information involved
- Email addressUser / member IDHome address
- Cause / key point
- A third party exploited vulnerabilities in a system provided by the vendor Commune. Commune has blocked the access route and implemented necessary security measures.About Supply chain attacks (via vendors & shared services)
- Industry
- Manufacturing
- Listing / capital
- Listed company東証プライム 7261(マツダ)
- Last updated
- October 20, 2026
Stock price reaction to the disclosureマツダ / 東証プライム 7261
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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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Other incidents at マツダ
Incidents related to "commune"
Incidents where the damage spread through the same service or system.
- C渋谷未来デザイン（渋谷未来デザイン COMMUNITY）2026.10.11 announced・Affected 495 people
- SSコミューン（Commune・Commune for Work）2026.10.09 announced・Affected 307,000 people
- Sちとせグループ（ちとせアカデミー）2026.10.09 announced・Affected 843 people
- Aバンダイナムコエクスペリエンス（湾岸ミッドナイト アーケードポータル）2026.10.09 announced・Affected Unknown
- Aカルビー（絶品部「やめられない、とまらない」課）2026.10.09 announced・Affected Unknown
- Aダイドードリンコ（dydoいっしょにラボ）2026.10.09 announced・Affected Unknown
Incidents related to "コミューン"
Incidents where the damage spread through the same service or system.
Same attack method
- S第一興商（ビッグエコー等）2026.10.08 announced・Affected 8,631,000 records
- A旭化成セラピューティクス（Pharma DIGITAL）2026.10.06 announced・Affected 514,000 people
- A大和証券2026.10.05 announced・Affected 220,000 records
- CTOPPAN（損保ジャパン）2026.09.29 announced・Affected 177,426 people
- A大東ガス株式会社2026.09.28 announced・Affected 124,000 records
- A大阪大学2026.10.21 announced・Affected 77,851 people
Same industry
- SS精電舎電子工業2026.07.21 announced・Affected Unknown
- SS富士フイルムメディカル株式会社2025.12.23 announced・Affected 590,000 people
- S大川精螺工業株式会社2026.07.24 announced・Affected Unknown
- S新エフエイコム(岡谷鋼機グループ)2026.07.21 announced・Affected Unknown
- S三浦工業2026.05.18 announced・Affected 5,021 records
- S東山産業株式会社2026.05.12 announced・Affected Unknown
Attack method classification: Supply chain attacks (via vendors & shared services)(Compromising the provider instead of the user)
Read the Supply chain attacks (via vendors & shared services) guide and national trends →