What data was exposed in the French tax breach?

Hackers accessed tax-related data, including income, family coefficients, and tax withholding rates. Property records and company identification numbers (SIREN) were also compromised. User login credentials remain secure.

Who is responsible for the French tax authority cyberattack?

The attack was carried out by a hacker using the alias ZeroBytes, who listed the stolen database for sale on a hacker forum. French authorities are investigating with ANSSI.

What actions have French authorities taken following the breach?

French authorities have disabled access to vulnerable systems, notified the CNIL regulator, and begun sending notifications to affected individuals. The investigation, led by ANSSI, is ongoing.

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Security

Data Breach in France: 678,000 Taxpayers Affected

August 17, 2026

Photo: BleepingComputer

Quick answer

France’s tax authority DGFiP confirmed a data breach affecting 678,000 individuals after a cyberattack. Hackers accessed tax records, property data, and company identifiers but failed to compromise user credentials.

France’s Ministry of Economy and Finance has confirmed a data breach affecting 678,000 taxpayers. The incident was discovered after a hacker using the alias ZeroBytes claimed responsibility and listed the stolen database for sale on the PwnForums hacker forum.

The compromised data includes tax-related information such as income, family coefficients, and tax withholding rates, as well as property records and company identification numbers (SIREN). Authorities emphasized that user accounts were not compromised—login credentials remain secure.

Following the breach, access to vulnerable systems was blocked. The investigation is being conducted with France’s National Cybersecurity Agency (ANSSI). The Ministry also announced it would begin notifying affected individuals starting Monday with data protection recommendations.

This incident is the latest in a series of cyberattacks targeting French government institutions. Earlier this year, data breaches were reported at France Travail employment agency and the FICOBA national banking registry.

Common questions

What data was exposed in the French tax breach?: Hackers accessed tax-related data, including income, family coefficients, and tax withholding rates. Property records and company identification numbers (SIREN) were also compromised. User login credentials remain secure.
Who is responsible for the French tax authority cyberattack?: The attack was carried out by a hacker using the alias ZeroBytes, who listed the stolen database for sale on a hacker forum. French authorities are investigating with ANSSI.
What actions have French authorities taken following the breach?: French authorities have disabled access to vulnerable systems, notified the CNIL regulator, and begun sending notifications to affected individuals. The investigation, led by ANSSI, is ongoing.

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