# A security researcher built a self-spreading worm that hides inside Word docs and hijacks Microsoft Copilot

> A security researcher built a self-spreading worm that hides inside Word docs and hijacks Microsoft Copilot A security researcher has shown how a prompt injection attack in Microsoft Copilot for Word can spread on its…

- **Source:** [The-decoder](https://the-decoder.com/a-security-researcher-built-a-self-spreading-worm-that-hides-inside-word-docs-and-hijacks-microsoft-copilot/?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6a6e0f0a5d9c24383c7949ad)
- **Published:** 2026-08-01
- **Category:** AI & Bots
- **Tags:** #microsoft #copilot #ai
- **Canonical:** http://localhost:4321/a/6a6e0f0a5d9c24383c7949ad

---

_GearOpen's distilled summary. The full original article is published at The-decoder (source link above); GearOpen does not republish the source's full text._