High severity · published Feb 10, 2026
CVE-2026-21523
GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
8.0
CVSS
0.8%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MV
Microsoft Visual Studio Code CoPilot Chat Extension · Microsoft
0.27.0 before 0.37.1 · source: vendor
VS
Visual Studio Code · Microsoft
1.0.0 before 1.110.1 · source: vendor, NVD
Affected product
MV
Microsoft Visual Studio Code CoPilot Chat Extension
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21523
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21523
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523
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