
French Tax Breach Exposes Critical Government Cybersecurity Gaps
Between May and August 2026, attackers used stolen staff passwords to access France's tax administration (DGFIP) systems, exfiltrating personal and business data on over 600,000 taxpayers. The breach went undetected for seven weeks, exploiting weak authentication, poor network segmentation, and inadequate monitoring across government networks. Attackers used infostealers to harvest credentials from personal devices, then moved laterally through interconnected ministry systems to access sensitive tax databases and messaging platforms. The incident highlights critical vulnerabilities in government cybersecurity infrastructure and the cascading risks of credential-based attacks in interconnected environments.
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