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French tax authority breached: 678,000 taxpayers exposed, and what this leak changes for companies

France's Directorate General of Public Finances confirmed on 13 August 2026 the theft of tax data belonging to some 678,000 individuals and businesses. The attacker forced no door open: he walked in with the identity of a civil servant and that of an authorised third party, then exfiltrated data drop by drop over several weeks. That pattern — a stolen legitimate account, slow egress, no volume threshold crossed — is exactly what is hitting French companies today. A review of the facts, of the government's response, and of the countermeasures that actually work: darkweb monitoring, detection of credentials stolen by infostealers, and SOC correlation.