モスフードサービス（モス WEB 会員）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- November 4, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 7,500,000 records
- Main impact
- Unauthorized access to the email delivery system resulted in the leakage of 約750万件 of member information (email addresses, age, gender, etc.). Payment information such as credit card details was not included.
- Information involved
- Email address
- Cause / key point
- The information leak was due to unauthorized access to the system of the vendor contracted to handle email delivery.
- Industry
- Food & dining
- Listing / capital
- Listed companyTSE Prime 8153
- Sources
- Last updated
- November 5, 2026
Stock price reaction to the disclosureモスフードサービス（モス WEB 会員） / 東証プライム 8153
Stock information is reference data based on Yahoo Finance and may be delayed. This site does not solicit or advise investment and does not guarantee the accuracy or completeness of this information. We accept no liability for any investment decision based on it.
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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: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)
Read the Unauthorized access (method undisclosed) guide and national trends →