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Tchap hit by cyberattack

Incident
First reported
Last updated
Happening score
H score 48
1 unique sources, 2 articles

Summary

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A compromised user account enabled an unauthorized breach of Tchap, putting the French government's encrypted messaging platform at risk of exposing conversations and personal data. The incident was detected by ANSSI and disclosed by DINUM on Monday, with investigation still underway.

Related Happenings

Tchap public chat data leak

Data Leak
H score52 First: 12.06.2026 10:09 Last: 12.06.2026 10:09 Sources 1

How related: Potentially exposed data from user accounts concerns at least: last name, first name, email address, belonging entity and avatar.

About this happening: The Tchap data leak exposed public-sector user information for 73,467 agents after a compromised user account was used to access non-encrypted public chat rooms. The e...

Open Happening

Customer hit by ransomware attack

Incident
H score32 First: 11.11.2025 17:01 Last: 11.11.2025 17:01 Sources 1

About this happening: A customer environment was intruded by RansomHub affiliates, and the compromise was contained before it became ransomware, preventing business interruption. The attackers...

Open Happening

Timeline

  1. 12.06.2026 10:09 1 articles · 1mo ago

    Tchap breach exposes data from 73,467 French public-sector accounts

    Victim Impact Update

    DINUM said a compromised user account accessed Tchap public chat rooms, exposing data shared by about 73,467 French public-sector agents, including names, email addresses, belonging entity and avatar images, while encrypted private conversations remained protected.

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  2. 09.06.2026 03:00 1 articles · 1mo ago

    ANSSI detects a breach of Tchap via a compromised account

    Detection Ioc Update

    ANSSI detected a breach of Tchap on Sunday after a compromised user account was used to access the French government's encrypted messaging platform, indicating unauthorized access to a service designed for the French public sector.

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  3. 09.06.2026 03:00 2 articles · 1mo ago

    DINUM alerts CNIL and Tchap users after the breach

    Initial Disclosure

    DINUM disclosed the Tchap breach on Monday, alerted France's CNIL, and notified Tchap users while investigators reviewed logs to determine which conversations the attacker could access and whether personal data was exposed; users were also reminded that public chat rooms are not encrypted and should not contain sensitive information.

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