ムラウチドットコムData breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- September 15, 2026
- Severity
- SCompromise of deep personal data or usable credentials.
- Scale
- 7,710,000 records
- Main impact
- Customer data for 771万件超 were leaked, mainly names, addresses, and phone numbers. Email addresses, dates of birth, and gender were partially included, while passwords and card information were excluded.
- Information involved
- Email addressPhone numberHome addressFull nameDate of birth
- Cause / key point
- The incident was initiated by unauthorized access that exploited a vulnerability in a web system.About Exploitation of vulnerabilities
- Industry
- Retail & e-commerce
- Listing / capital
- Unlisted
- 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: Exploitation of vulnerabilities(Breaking in through holes in software and devices)
Read the Exploitation of vulnerabilities guide and national trends →