CVE-2025-66389

PoC —

CVSS 3.1

7.5 high

EPSS

1%p66

Published

Jun 22, 2026 (Jun 22, 2026)

Modified

Jun 30, 2026

Description

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.

Vendors: microsoft
Products: github copilot
Weakness: CWE-552
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (1.2%)

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