French Government Messaging Platform Breached by Mysterious ‘Misere’ Hacker
More 70,000 French government employees had personal details stolen. Why and by whom?
On June 8, 2026, DINUM announced that the official French government chat service (Tchap) had been breached on June 7. At the same time, a threat actor calling itself ‘misere’ claimed responsibility.
DINUM is the French government’s interministerial digital directorate in charge of Tchap.
Tchap is a ‘secure’ sovereign instant messaging service for French government employees designed to combine the principle of data sovereignty with increased security over third-party foreign systems. It includes secure chat rooms that are end-to-end encrypted, and ‘public’ chat rooms that are not encrypted.
Misere is… unknown. There is no public record of a threat actor known as ‘misere’.
DINUM says the system was compromised following account hijacking, and states, “Of the more than 825,000 registered agents, 73,467 are reportedly affected by this incident, representing less than 9% of registered users.”
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