PT-2026-51297 · Undefined · Undefined

Published 2026-06-22 · Updated 2026-06-22 · CVE-2025-66389

Mitre

CVSS v3.1

7.5

High

Base vector

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

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.

Fix

Files Accessible to External Parties

Weakness Enumeration

CWE-552

Related Identifiers

CVE-2025-66389

Affected Products

Undefined

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2025-66389 · Security Note
• https://github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.ts#L152 · Note
• https://blindcyber.com/2025/10/28/copilot-fun · Note
• https://github.com/microsoft/vscode-copilot-chat · Note