CVE-2025-66389

State: Published
Severity: 7.5 High
Published: Jun 22, 2026
Updated: Jun 22, 2026
Reserved: Nov 28, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	CISA-ADP

Weaknesses

CWE-552 Files or Directories Accessible to External Parties

Affected Products

Product	Versions
n/an/a	n/aAffected

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

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