What is CVE-2026-21523?

CVE-2026-21523 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-21523 cover?

CVE-2026-21523 covers the following CVE IDs: CVE-2026-21523. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21523?

CVE-2026-21523 has a CVSS v3 base score of 8.0, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21523?

CVE-2026-21523 affects 2 products, including: Microsoft Visual Studio Code CoPilot Chat Extension; Visual Studio Code.

CVE-2026-21523HighCVSS 8.0

GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

February 10, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21523 →

📋 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.

🎯 Affected products2

Microsoft Visual Studio Code CoPilot Chat Extension
Visual Studio Code

✅ Remediation

KBRelease Notes (Security Update) — fixed build 0.37.1 KBRelease Notes (Security Update) — fixed build 1.110.1

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523
patchhttps://code.visualstudio.com/Download
referencehttps://github.com/microsoft/vscode/
patchhttps://code.visualstudio.com/download
referencehttps://code.visualstudio.com/updates/v1_110