CVE-2025-66389

Name: CVE-2025-66389
Creator: NVD / NIST
Published: 2026-06-22T14:16:24.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.36%

Last modified Jun 22, 2026

This CVE is reserved or awaiting analysis. Details will appear once published by NVD.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.36%

27.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-552

References

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

Timeline

Published: Jun 22, 2026
Last Modified: Jun 22, 2026
Status: Awaiting Analysis

Are you affected by CVE-2025-66389?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST