CVE-2026-21523
GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
CVSS Score
8.0
EPSS Score
0.0%
EPSS Percentile
10th
Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.
| Vendor | microsoft |
| Product | microsoft visual studio code copilot chat extension |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Feb 10, 2026 |
| Last Updated | Apr 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Microsoft / Microsoft Visual Studio Code CoPilot Chat Extension
0.27.0 < 0.37.1
Microsoft / Visual Studio Code
1.0.0 < 1.109.2