What is CVE-2026-21516?

CVE-2026-21516 is a high-severity vulnerability in Microsoft Github_copilot, classified under Command Injection. CVSS score: 8.8/10. Published 2026-02-10.

How severe is CVE-2026-21516?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Microsoft Github_copilot

CVE-2026-21516

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

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.008 (52.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Microsoft Github_copilot
Microsoft Github Copilot Plugin For Jetbrains Ides — versions 1.0.0

Weakness classification (CWE)

CWE-77 — Command Injection

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21516?: CVE-2026-21516 is a high-severity vulnerability in Microsoft Github_copilot, classified under Command Injection. CVSS score: 8.8/10. Published 2026-02-10.
How severe is CVE-2026-21516?: High severity. CVSS v3 base score is 8.8 out of 10.