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Workspace trust for MCP servers

Low
connor4312 published GHSA-6xq8-9qf3-p6qv Feb 10, 2026

Package

vscode

Affected versions

<1.109.1

Patched versions

1.109.1

Description

VS Code - Remote Code Execution Vulnerability

A remote code execution vulnerability exists in VS Code 1.109.0 and earlier versions where workspace trust was not always demanded to start MCP servers.

Patches

The fix is available starting with VS Code 1.109.1. The fix mitigates this attack by performing explicitly demanding trust before starting MCP servers.

Workarounds

Do not use interact with Copilot on untrusted workspaces in VS Code versions prior to 1.109.1.

References

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

CVE ID

CVE-2026-21518

Weaknesses

No CWEs