Over 1 Million MUJI Cards May Have Leaked in Cyberattack | News On Japan

November 4, 2026 1 Min Read 0

Threat Intelligence Brief

Curated summary with source attribution

Source: newsonjapan.com

Threat Risk: High
Victim: Retail and Hospitality Customers
Incident: Unauthorized access leading to a data breach of MUJI Card and Denny’s customer information.
Impact: Potential financial fraud and identity theft for over 1 million users.
Attacker: Unidentified threat actors
Analysis: Ryohin Keikaku reports a potential leak of 1.09 million MUJI Card records, specifically targeting credit card numbers. Simultaneously, Denny’s reported a breach affecting user data from a legacy application. These incidents highlight the persistent risk of unauthorized access to large-scale customer databases.
Recommendations: Monitor credit card statements for unauthorized transactions; Update all mobile applications to the latest versions; Enable multi-factor authentication on linked accounts
Source: News On Japan

Editorial note: this post summarizes third-party reporting and links to the original source.
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