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.
History

Mon, 22 Jun 2026 19:45:00 +0000

Type Values Removed Values Added
Title GitHub Copilot 1.372.0 Filesystem Access Outside Workspace via File-Handler URI

Mon, 22 Jun 2026 18:45:00 +0000

Type Values Removed Values Added
Title Filesystem Exfiltration via Unauthorized File-Handler URI in GitHub Copilot
Weaknesses CWE-200
CWE-284

Mon, 22 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-552
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 22 Jun 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft
Microsoft copilot
Vendors & Products Microsoft
Microsoft copilot

Mon, 22 Jun 2026 14:45:00 +0000

Type Values Removed Values Added
Title Filesystem Exfiltration via Unauthorized File-Handler URI in GitHub Copilot
Weaknesses CWE-200
CWE-284

Mon, 22 Jun 2026 13:45:00 +0000

Type Values Removed Values Added
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.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-22T16:02:08.057Z

Reserved: 2025-11-28T00:00:00.000Z

Link: CVE-2025-66389

cve-icon Vulnrichment

Updated: 2026-06-22T16:02:02.785Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-22T19:30:06Z