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Vulnerability record · CVE-2025-66389 · published 22 June 2026

CVE-2025-66389: Microsoft github copilot vulnerability

Microsoft · Github Copilot

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.

7.5 CVSS 3.1 High EPSS 1.2% · top 33.7% CWE-552 · CWE-552
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
30 Jun 2026Last modified 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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron Product

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Source: NIST National Vulnerability Database (record CVE-2025-66389), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.