CVE-2025-66389 — HIGH (7.5)

Vulnerability 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.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Microsoft	Github Copilot	1.372.0

Related Weaknesses (CWE)

CWE-552

References

https://blindcyber.com/2025/10/28/copilot-fun/ExploitThird Party Advisory
https://github.com/microsoft/vscode-copilot-chat/Product
https://github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bbProduct

FAQ

What is CVE-2025-66389?

CVE-2025-66389 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...

How severe is CVE-2025-66389?

CVE-2025-66389 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-66389?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Github Copilot.