AI Worm Propagation Vulnerability in Microsoft Copilot
July 29, 2026
A technical analysis reveals that document-borne AI worms can self-propagate through Copilot for Word via Cross-Domain Prompt Injection Attacks (XPIAs). Vulnerabilities allow external inputs within documents to influence and potentially compromise Copilot responses across interactions.
HOW THIS AFFECTS YOU
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builderYou must implement rigorous input sanitization and isolation when agents process user-provided files.
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policyThis necessitates stricter governance around how LLM agents interact with untrusted external document content.