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French Government App Tchap Faces Data Breach Investigation
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French Government App Tchap Faces Data Breach Investigation

WireByte Staff · June 10, 2026

France's government-exclusive messaging app, Tchap, is under investigation after an attacker claimed to have stolen 13.5GB of data, including user accounts and messages. The breach, allegedly via a compromised account, raises concerns about state-targeted espionage, prompting a probe by cybersecurity agencies.

Key points

  • The French government's internal messaging app, Tchap, has reportedly been breached.
  • A threat actor claims to have exfiltrated 13.5GB of data, including 73,467 accounts and over 640,000 messages.
  • The attacker allegedly gained access using a stolen valid account.
  • French cybersecurity agencies ANSSI and DINUM are investigating the incident.
  • The breach raises concerns about potential espionage targeting government communications.

France's government-exclusive messaging application, Tchap, is currently the subject of an investigation following claims of a significant data breach. A threat actor, operating under the alias "misere," has asserted responsibility for the incident on the dark web, alleging the exfiltration of 13.5 gigabytes of sensitive data.

The purported stolen information includes details of over 73,000 user accounts and more than 640,000 messages. The attacker claims to have exploited social engineering tactics to gain access through a compromised valid account. While private chats are reportedly encrypted, public rooms may have been exposed. French digital affairs directorate DINUM and national cybersecurity agency ANSSI are actively investigating these allegations.

This incident occurs amidst broader concerns regarding espionage targeting government messaging platforms. Tchap was introduced as a secure alternative to foreign applications for French public servants, following a directive to restrict the use of external tools for official communication. The scale and implications of any potential data compromise are yet to be fully confirmed by authorities.

Sources

WireByte Staff — Editorial Team

The WireByte editorial team synthesises technology news from multiple primary sources, verifies the facts, and links every source. Articles are produced with AI assistance and reviewed under our editorial policy.