Research reveals self-propagating AI worms can exploit Copilot in Word documents

Jul 29, 2026

AI Summary

A technical analysis has uncovered vulnerabilities in Microsoft's Copilot for Word, allowing AI worms to self-propagate through documents. Attackers can embed hidden instructions in documents that Copilot interprets, leading to unauthorized alterations in subsequent documents and potentially spreading the attack within organizations.

A technical analysis has shown that Copilot for Word can be exploited by embedding hidden instructions in documents, which can then alter the content of other documents.
This vulnerability allows attackers to create self-propagating AI worms that can spread through trusted document workflows without needing access to the victim's Microsoft 365 tenant.
The attack begins with a malicious document containing a concealed prompt that Copilot reads and executes, leading to changes in financial reports or other documents.
Once a document is altered, it can carry the hidden instructions forward, allowing the attack to propagate further when used in new drafting sessions.
The propagation mechanism remains exploitable, with no robust mitigation currently available, despite attempts by Microsoft to address the issue.
The attack can spread through internal documents shared among colleagues, complicating traceability and increasing the risk of misinformation within organizations.
The vulnerabilities could also extend to collaborative environments, potentially affecting multiple organizations through shared documents on platforms like SharePoint and Teams.

ai wormsself-propagationmicrosoft wordcopilotcybersecurity

Research reveals self-propagating AI worms can exploit Copilot in Word documents

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