CVE-2026-21523

Published: Feb 10, 2026

Modified: May 11, 2026

PUBLISHED

CVSS v3.1

8.0

HIGH

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	Product	Versions
Microsoft	Microsoft Visual Studio Code CoPilot Chat Extension	affected `0.27.0 - < 0.37.1`
Microsoft	Visual Studio Code	affected `1.0.0 - < 1.110.1`

CVSS v3.1 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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

vendor-advisory

patch

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