French retail giant **Auchan** suffered a cyberattack in August 2025, resulting in the theft of **loyalty account data** from several hundred thousand customers. Attackers accessed personal information, including **names, postal/email addresses, phone numbers, and loyalty card numbers**, though **financial data (bank details, PINs, and loyalty balances) remained secure**. The breach was detected and contained promptly, with notifications sent to affected customers and France’s data protection authority (**CNIL**). This marks Auchan’s **second major breach in a year**, following a similar November 2024 incident targeting loyalty program data. While no passwords or payment credentials were compromised, the stolen data poses risks for **targeted phishing attacks** or underground sale. Auchan has implemented **multi-factor authentication, enhanced network monitoring, and employee cybersecurity training**, alongside offering **free credit monitoring** to impacted customers. Authorities are investigating the attack’s origin, while consumers are warned to stay vigilant against fraudulent communications.
Source: https://gbhackers.com/french-retailer-auchan-hit-by-cyberattack/
TPRM report: https://www.rankiteo.com/company/auchan
"id": "auc842090225",
"linkid": "auchan",
"type": "Breach",
"date": "11/2024",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': 'Several hundred thousand',
'industry': 'Supermarket/Retail',
'location': 'France',
'name': 'Auchan',
'size': 'Large (one of France’s leading supermarket '
'chains)',
'type': 'Retail'}],
'customer_advisories': 'Auchan urged customers to scrutinize unsolicited '
'emails/texts seeking personal/financial details and '
'offered complimentary credit monitoring services.',
'data_breach': {'data_exfiltration': 'Yes (personal data stolen)',
'number_of_records_exposed': 'Several hundred thousand',
'personally_identifiable_information': ['Names',
'Postal addresses',
'Email addresses',
'Phone numbers',
'Loyalty card '
'numbers'],
'sensitivity_of_data': 'Moderate (no financial or password '
'data exposed)',
'type_of_data_compromised': ['Personal Identifiable '
'Information (PII)']},
'date_detected': '2025-08-21',
'date_publicly_disclosed': '2025-08-21',
'description': 'French retail giant Auchan announced on August 21 that it '
'fell victim to a cyberattack resulting in the theft of '
'loyalty account information belonging to several hundred '
'thousand customers. Attackers accessed personal data such as '
'names, postal and email addresses, phone numbers, and loyalty '
'card numbers. Financial data, including bank details, loyalty '
'card PINs, and accrued loyalty balances, remained secure. The '
'breach was promptly detected and contained. Auchan notified '
'impacted customers and reported the incident to the French '
'data protection authority (CNIL). This marks the second '
'significant data breach at Auchan within a year, following a '
'similar attack in November 2024 targeting customer loyalty '
'information.',
'impact': {'brand_reputation_impact': 'Negative (second breach within a year, '
'eroding consumer trust)',
'data_compromised': ['Names',
'Postal addresses',
'Email addresses',
'Phone numbers',
'Loyalty card numbers'],
'identity_theft_risk': 'Moderate (personal data exposed, but no '
'financial or password data compromised)',
'operational_impact': 'Heightened operational pressures, need to '
'restore consumer confidence, and strengthen '
'cybersecurity posture',
'payment_information_risk': 'None (financial data remained secure)',
'systems_affected': ['Loyalty account systems']},
'initial_access_broker': {'data_sold_on_dark_web': 'Likely (personal data '
'harvested for resale or '
'phishing)',
'high_value_targets': ['Loyalty program databases']},
'investigation_status': 'Ongoing (French authorities and Auchan’s IT security '
'teams collaborating to trace the attack’s origin)',
'lessons_learned': 'Importance of vigilance against phishing attempts, need '
'for robust cybersecurity measures (e.g., MFA, monitoring, '
'employee training), and proactive customer communication '
'to mitigate reputational damage.',
'motivation': 'Data Theft (Likely for phishing or resale on dark web)',
'post_incident_analysis': {'corrective_actions': ['Deployment of multifactor '
'authentication (MFA) for '
'internal systems',
'Enhanced network '
'monitoring',
'Mandatory cybersecurity '
'training for employees',
'Complimentary credit '
'monitoring for affected '
'customers']},
'recommendations': ['Enhance cybersecurity defenses, particularly for loyalty '
'program databases.',
'Implement stricter access controls and continuous '
'monitoring for unusual activity.',
'Conduct regular security audits and penetration testing.',
'Provide ongoing phishing awareness training for '
'customers and employees.',
'Consider third-party security assessments to identify '
'vulnerabilities.'],
'references': [{'date_accessed': '2025-08-21',
'source': 'Auchan Official Statement'},
{'date_accessed': '2025-08-21',
'source': 'News Article (Generic Placeholder - Follow for '
'updates on Google News, LinkedIn, X)'}],
'regulatory_compliance': {'regulatory_notifications': ['Reported to '
'Commission nationale '
'de l’informatique et '
'des libertés (CNIL)']},
'response': {'communication_strategy': 'Official statement released; impacted '
'customers notified; advisory issued '
'for phishing vigilance',
'containment_measures': 'Breach contained promptly',
'enhanced_monitoring': 'Yes (strengthened network monitoring)',
'incident_response_plan_activated': 'Yes',
'law_enforcement_notified': 'Yes (collaborating with French '
'authorities and law enforcement)',
'recovery_measures': ['Complimentary credit monitoring services '
'for affected customers'],
'remediation_measures': ['Accelerated deployment of multifactor '
'authentication (MFA) for internal '
'systems',
'Strengthened network monitoring '
'capabilities',
'Mandatory cybersecurity training for '
'all employees']},
'stakeholder_advisories': 'Customers advised to remain alert for phishing '
'attempts and report suspicious communications.',
'title': 'Auchan Cyberattack Results in Theft of Loyalty Account Information',
'type': 'Data Breach'}