CVE-2026-21523 HIGH

CVE-2026-21523: GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft Visual Studio Code CoPilot Chat Extension
Weakness CWE-367
Published February 10, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

8.0/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 10, 2026 CVE published
May 11, 2026 Record updated