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#prompt injection

White office documents on a dark desk connected by glowing red threads of code, illustrating a self-spreading AI worm that hijacks Microsoft Copilot.

A Hidden 'AI Worm' Can Spread Through Word Documents by Hijacking Copilot — and Microsoft Has No Fix Yet

A researcher showed that hidden text in a shared Word file can hijack Microsoft's Copilot, silently rewrite your documents, and copy itself into new files to spread — a self-propagating 'AI worm.' Microsoft's fixes have so far failed.

Jul 29, 2026