Microsoft Word Copilot
AssessTools
An AI assistant integrated into Microsoft Word for drafting and editing documents.
Why it's here
Placed in Assess: 1 article(s) of evidence from 2 source(s), led by security coverage, with 1 in the last 30 days. Confidence 32%.
Evidence (1)
- 8Simon Willison·7/29/2026securityPrompt injection worm found in Microsoft Word Copilot
A researcher demonstrated a prompt injection variant that can turn hidden instructions in a Word document into a self-replicating worm when processed by Copilot for Word. If Copilot includes those instructions in the edited output, the resulting document can carry them forward and trigger the same behavior in later Copilot-assisted workflows. Microsoft was responsibly disclosed to, but no complete mitigation is available yet for the full class of attack.