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France’s Government Messaging App Tchap Got Breached

Securityaffairs.Co •Pierluigi Paganini • June 10, 2026

France’s government chat app Tchap was breached after a single account was compromised, exposing messages and data from public channels. Tchap, the encrypted messaging platform developed by the French government for its civil servants and made mandatory last year, was breached on June 7. ANSSI, France’s cybersecurity agency, detected the intrusion. The vector was straightforward: […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Breach of France's Tchap Messaging Service Exposes Sensitive Data On June 7, 2026, the French government's encrypted messaging platform Tchap was breached due to an account hijacking. The attack was executed through social engineering, compromising a user account linked to Tchap's education environment. The attacker claims to have accessed data from approximately 73,000 state agents, including 643,000 messages and nearly 60,000 files, totaling about 13.5 GB of data. French authorities, including the National Cybersecurity Agency (ANSSI) and the Digital Affairs Directorate (DINUM), are investigating the incident and have blocked the compromised account. While DINUM asserts that private conversations remain secure due to encryption, the attacker claims broader access, raising concerns about the true extent of the breach. The incident has been reported to France's data protection authority, CNIL, due to potential exposure of personal data. Investigations are ongoing to ascertain the full impact and nature of the data accessed. 16 sources 64

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France’s Government Messaging App Tchap Got Breached

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