A silent AI worm spreads through Copilot for Word — and Microsoft can’t patch it

On July 28, 2026, researcher Håkon Måløy published the first public demonstration of a document-borne AI worm capable of silently altering financial reports and self-propagating through Microsoft Copilot for Word. After 144 days of coordinated disclosure and two attempted fixes — including a model upgrade to GPT-5.6 — the vulnerability class remains exploitable.