The French Ministry of the Economy and Finance has disclosed a data breach after an attacker accessed the General Directorate of Public Finances (DGFiP) systems and stole data belonging to 678,000 individuals.
This incident was discovered after a threat actor using the "ZeroBytes" handle claimed the attack and listed a stolen database for sale on August 12 on the PwnForums hacking forum.
"The in-depth investigations conducted since August 12, 2026, have established that, prior to their interruption, these access points had been used to consult and extract data concerning a total of 678,000 individuals and professionals, including tax data such as reference tax income, family quotient, and withholding tax rate, and, for businesses, data such as their company name and SIREN number," the French Finance Ministry said.
"Cadastral data relating to addresses and property sizes were also accessed. As soon as these data breaches were identified, the French Public Finances Directorate (DGFIP) notified the French Data Protection Authority (CNIL). The online accounts of individual and professional users were not compromised. User IDs and passwords were not compromised."
After detecting the attack, the French tax administration shut down access to sensitive information systems and continues investigating the incident with the help of the National Cybersecurity Agency of France (ANSSI) to assess the breach's full impact.
In a post on the hacking forum, ZeroBytes also claimed they gained access to the Serveur Professionnel de Données Cadastrales (SPDC), an online platform operated by the French tax authority that provides access to the country's central land registry and property ownership records.
While the portal gave them access to data on roughly 20 million French citizens, the threat actor claims they only managed to steal 252,149 records containing data on over 2 million people.
"We couldn't finish the extraction because honestly, it's just horrible to scrape and would have taken months. I'm still logged into the panel, so if you want, you can buy it along with the database," they said. "I'm not going to sell this one for very much anyway. And as always, no mention from France about this incident."
The French Finance Ministry added on Friday that it will contact all affected individuals starting next week via email or letter, with details on what data may have been accessed or stolen and the necessary precautions to take.
This is just the latest in a spree of cyberattacks and data breaches that have impacted multiple French government agencies in recent months.
In January, the French data protection authority fined the national employment agency France Travail €5 million after hackers stole the personal information of 43 million people. One month later, the French Ministry of Finance disclosed another data breach affecting over 1.2 million user accounts after hackers stole a database from the national bank account registry (FICOBA) systems.
More recently, France Titres, the government agency in France for issuing and managing administrative documents, also disclosed a data breach after a threat actor put up for sale a database containing 19 million records allegedly stolen from the National Agency for Secure Documents (ANTS).
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