Tchap Data Breach 2026: What 643,000 Leaked Government Messages Reveal About Secure Messaging Architecture
June 9, 2026
On June 8, 2026, cybersecurity intelligence platform FrenchBreaches disclosed that a threat actor claimed to have breached Tchap — the interministerial messaging application mandated for all French civil servants. The attacker alleges exfiltration of 13.51 GB of data, including more than 643,000 messages, 59,386 media files, and identity data for over 73,000 government agents spanning the Ministries of Interior, Armed Forces, Economy and Finance, Justice, and Foreign Affairs.
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