What is CVE-2026-21516?

CVE-2026-21516 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. GitHub Copilot for Jetbrains Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-21516 cover?

CVE-2026-21516 covers the following CVE IDs: CVE-2026-21516. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21516?

CVE-2026-21516 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21516?

CVE-2026-21516 affects 1 product, including: GitHub Copilot Plugin for JetBrains IDEs.

CVE-2026-21516HighCVSS 8.8

GitHub Copilot for Jetbrains Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

February 10, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21516 →

📋 Description

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

🎯 Affected products1

GitHub Copilot Plugin for JetBrains IDEs

✅ Remediation

KBRelease Notes (Security Update) — fixed build 1.5.63

🔗 References (3)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21516
patchhttps://plugins.jetbrains.com/plugin/17718-github-copilot--your-ai-pair-programmer/versions/stable
referencehttps://plugins.jetbrains.com/plugin/17718-github-copilot--your-ai-pair-programmer/versions/stable/933548