Securing Claude Cowork: File Exfiltration in 48 Hours, CVEs, and What You Must Do Now

Published 2026-03-20 by Security Team

Within 48 hours of launch, researchers demonstrated that a single Word document could trick Claude Cowork into uploading sensitive files to an attacker. Combined with two critical CVEs and a broken permission model, here is how to actually secure your Cowork setup.

Tags: Claude Code, Cowork, Security, Prompt Injection

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