French tax authority data breach affects 678,000 individuals

The French Ministry of the Economy and Finance disclosed a data breach affecting 678,000 individuals after a threat actor using the handle 'ZeroBytes' claimed responsibility and listed a stolen database for sale on the PwnForums hacking forum on August 12, 2026. The attacker accessed the General Directorate of Public Finances (DGFiP) systems, extracting sensitive tax and cadastral data, including reference tax income, family quotient, withholding tax rate, company names, SIREN numbers, and property records. Access to sensitive systems was shut down, and the incident is under investigation with support from ANSSI, though user credentials were not compromised.

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