CVE-2025-66389

HIGH

GitHub Copilot 1.372.0 - Unauthenticated Filesystem Access via File-Handler URI Parameter

Title source: llm

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.

References (3)

Core 3

Core References

https://github.com/microsoft/vscode-copilot-chat/

https://github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.ts#L152

View Writeup ZIP pw:eip

https://blindcyber.com/2025/10/28/copilot-fun/

Scores

CVSS v3 7.5

EPSS 0.0036

EPSS Percentile 27.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-552

Status published

Published Jun 22, 2026

Tracked Since Jun 22, 2026