French Retail Giant Auchan Discloses Cyberattack on Loyalty Accounts

French retail giant Auchan has confirmed that a cyberattack compromised the personal data of several hundred thousand customers, with the breach specifically targeting its loyalty program. The company announced the incident on August 21, stating that while the attack was quickly detected and contained, it resulted in unauthorized access to sensitive customer information.

The stolen data includes full names, email addresses, postal addresses, phone numbers, and loyalty card numbers. Crucially, Auchan has reassured the public that no financial details, such as bank account information, passwords, or PIN codes, were exposed in the breach. This is the second such incident in less than a year, following a similar attack in November 2024.

According to the company’s statement, all affected customers are being notified directly, and the incident has been reported to the Commission Nationale de l’Informatique et des Libertés (CNIL), France’s data protection authority. In response to the breach, Auchan has taken immediate security measures, including deactivating the compromised loyalty cards. Affected customers are now required to visit a physical store to obtain a new card and restore their loyalty savings.

The attack serves as a stark reminder of the value of customer data to cybercriminals. While financial theft was not the primary outcome of this breach, the compromised information can be used for a variety of malicious purposes, including sophisticated phishing attacks, social engineering scams, and even identity theft. Security experts note that even non-financial data, when aggregated, provides criminals with a powerful tool to build trust and exploit vulnerabilities.

The incident at Auchan is part of a broader trend of cyberattacks targeting French companies in 2025, a year that has also seen major breaches at Bouygues Telecom. The recurring nature of these attacks highlights the ongoing need for vigilance and robust cybersecurity measures, particularly in the retail sector where extensive customer databases are a lucrative target. For consumers, the best defense is to remain vigilant against unexpected communications, use strong and unique passwords for different services, and be cautious of any messages requesting personal or financial details.