CVE-2025-66389: Microsoft GitHub Copilot

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

GitHub Copilot 1.372.0 allows filesystem access outside of a workspace folder (without user approval) via a file-handler URI parameter to fetch_webpage. Therefore, exfiltration could occur if there is indirect prompt injection.

Affected products

• Microsoft GitHub Copilot: version 1.372.0 only

Published 2026-06-22. Last modified 2026-10-05.