France’s Directorate General of Public Finances (DGFiP) has confirmed a cyberattack that resulted in the unauthorized access, consultation, and extraction of sensitive tax and cadastral information belonging to approximately 678,000 individuals and professional entities; occurred during June and July 2026, was publicly acknowledged on August 12 and 13. The compromised information includes tax-related details like reference tax income, family quotient, withholding tax rates, company names, SIREN numbers, and cadastral data covering property addresses and areas. DGFiP stressed that users’ online tax accounts, usernames, and passwords were not compromised. The attack relied on identity-based techniques rather than the exploitation of a publicly known software vulnerability. The credentials of a DGFiP employee and an authorized third party were impersonated to gain illegitimate access to internal information systems. After activity was detected, DGFiP immediately suspended affected accounts. Initial access-control checks failed to identify evidence of data theft because of the sophisticated intrusion. However, investigations launched on August 12 subsequently established that the compromised accounts had been used to consult and extract data before access was terminated. Authorities are continuing forensic investigations to determine the precise nature, volume, and scope of the stolen information. Following confirmation of the breach, DGFiP notified France’s data protection authority, CNIL, and introduced additional security measures, including preventive shutdowns affecting access to sensitive information systems. DGFiP information-security teams are working with the Ministry of Economy and Finance, the High Official for Defense and Security, and France’s national cybersecurity agency, ANSSI. The affected individuals and professionals are notified by email or post, explaining which information may have been accessed and recommending appropriate precautions. DGFiP also plans to file a criminal complaint and provide further updates as investigations continue. The incident demonstrates the serious risks posed by compromised legitimate credentials and highlights the importance of stronger identity verification, access monitoring, and rapid detection mechanisms within sensitive public-sector systems.
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