Eurofiber France has disclosed a significant cybersecurity incident detected on November 13, 2025, involving a software vulnerability in its ticket management platform and customer portals.
The breach resulted in unauthorized data exfiltration affecting multiple service brands and regional divisions. However, the company reports that critical financial information and customer services remained secure throughout the incident.
The compromised systems include the ticket management platform used by Eurofiber France and its affiliated regional brands Eurafibre, FullSave, Netiwan, and Avelia as well as the ATE customer portal serving Eurofiber Cloud Infra France.
An unknown malicious actor exploited a software vulnerability in these platforms to gain unauthorized access and extract sensitive user data.
The scope of the breach is geographically contained to Eurofiber France operations and does not extend to customer services operated by other Eurofiber entities in Belgium, Germany, or the Netherlands.
In terms of impact mitigation, Eurofiber France responded quickly upon discovery. Within the first hours following detection, the company implemented enhanced security measures on the affected ticketing platform and ATE portal, and patched the exploited vulnerability.
Additional protective measures have since been deployed to prevent further unauthorized access and strengthen overall system security.
Notably, the company confirms that sensitive financial information, such as banking details and critical data stored in separate systems, was not compromised during the attack.
All customer services remained fully operational throughout the incident and suffered no service disruptions.
Additionally, Eurofiber France filed an extortion complaint with relevant authorities, suggesting potential ransom demands may have accompanied the data exfiltration.
Overview of the Eurofiber Data Breach
The incident’s impact on indirect sales and wholesale partners in France is reported to be minimal, as most maintain separate systems and infrastructure.
This limitation suggests the vulnerability was specific to the affected platforms rather than representing a broader compromise of Eurofiber’s network infrastructure.
In response to the incident, Eurofiber France has initiated appropriate legal and regulatory procedures.
The company reported the breach to the CNIL (Commission Nationale de l’Informatique et des Libertés), France’s data protection authority operating under GDPR provisions, and notified ANSSI (Agence Nationale de la Sécurité des Systèmes d’Information), the National Cybersecurity Agency of France.
Customer notification began immediately upon incident discovery, with Eurofiber France committing to ongoing, transparent communication as investigations progress.
The company’s security teams continue collaborating with independent cybersecurity experts to assess the breach’s extent fully, support affected customers in managing consequences, and implement comprehensive remediation strategies.
Eurofiber France has reaffirmed its commitment to data protection, cybersecurity, and transparency with customers and regulatory bodies.
The company emphasizes that its teams remain fully mobilized in incident response efforts until complete resolution is achieved.
This breach highlights the ongoing threat that vulnerabilities in web-facing applications and customer portals present to service providers, particularly those managing sensitive infrastructure and customer information in critical sectors.
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