Massive theft of French tax data via stolen passwords

An attacker exploited stolen credentials to access data of hundreds of thousands of taxpayers.

Published 6sem1 sourceMajor

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The fact

The intrusion, undetected for seven weeks, targeted the French tax administration.

ANSSI describes the attack as unsophisticated but with serious consequences.

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Auto-synthesis from 1 media source · identified on September 29, 2026