CVE-2025-66389

GitHub Copilot 1.372.0 Filesystem Access Outside Workspace via File-Handler URI

Published Jun 22, 2026 CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title GitHub Copilot 1.372.0 Filesystem Access Outside Workspace via File-Handler URI
Type Values Removed Values Added
Title Filesystem Exfiltration via Unauthorized File-Handler URI in GitHub Copilot
Weaknesses CWE-200
CWE-284
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'}

Type Values Removed Values Added
First Time appeared Microsoft
Microsoft copilot
Vendors & Products Microsoft
Microsoft copilot
Type Values Removed Values Added
Title Filesystem Exfiltration via Unauthorized File-Handler URI in GitHub Copilot
Weaknesses CWE-200
CWE-284
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
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jun 22, 2026, 4:02 PM
Reserved
Nov 28, 2025, 12:00 AM
Status
Analyzed
Published
Jun 22, 2026, 2:16 PM
Modified
Oct 12, 2026, 10:10 PM