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

The DecoderAugust 1, 2026en

A security researcher has demonstrated a worm-like attack on Microsoft Copilot for Word: invisible prompt injections hidden in documents spread automatically into new files every time they're reused. Microsoft confirmed the issue but failed to fix it after 144 days and two attempts. The article A security researcher built a self-spreading worm that hides inside Word docs and hijacks Microsoft Copilot appeared first on The Decoder .

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