French Government's Encrypted Messaging App Breached by Hackers

WHO:

Engadget - A threat actor has claimed responsibility for the attack on France's encrypted Tchap messaging platform.

Techmeme - The French government, specifically DINUM (the digital affairs directorate), issued a warning regarding the breach.

WHAT:

Engadget - The French government's internal messaging service, Tchap, was compromised in a security breach.

Techmeme - Hackers used a hijacked user account to breach Tchap, which is an encrypted messaging app for civil servants with over 300,000 monthly users.

WHERE:

Engadget - The breach involved France's encrypted Tchap messaging platform.

WHY:

Techmeme - The breach was facilitated by the use of a hijacked user account.

HOW:

Techmeme - Hackers executed the breach by hijacking a user account on the Tchap platform.

(UPDATED June 9, 2026 15:58 UTC)

A threat actor has claimed responsibility for a security breach involving France's encrypted Tchap messaging platform, which is used by civil servants and has over 300,000 monthly users. The French government's digital affairs directorate, DINUM, has issued a warning about the incident, revealing that hackers gained access by hijacking a user account. This breach highlights vulnerabilities in the system designed to protect sensitive communications within the government.