What is CVE-2026-21256?

CVE-2026-21256 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. GitHub Copilot and Visual Studio Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-21256 cover?

CVE-2026-21256 covers the following CVE IDs: CVE-2026-21256. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21256?

CVE-2026-21256 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21256?

CVE-2026-21256 affects 2 products, including: Microsoft Visual Studio 2022 version 17.14; Microsoft Visual Studio 2026 version 18.3.

CVE-2026-21256HighCVSS 8.8

GitHub Copilot and Visual Studio Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

February 10, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21256 →

📋 Description

Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an unauthorized attacker to execute code over a network.

🎯 Affected products2

Microsoft Visual Studio 2022 version 17.14
Microsoft Visual Studio 2026 version 18.3

✅ Remediation

KBRelease Notes (Security Update) — fixed build 17.14.26 KBRelease Notes (Security Update) — fixed build 18.3.0

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21256
patchhttps://my.visualstudio.com/Downloads?q=Visual Studio 2022 version 17.14
referencehttps://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
patchhttps://my.visualstudio.com/Downloads?q=Visual Studio 2026 version 18.3
referencehttps://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes