CVE-2026-21516: Microsoft GitHub Copilot

High severity, CVSS 7.8. EPSS: 0.9% chance of exploitation in the next 30 days.

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 products

• Microsoft GitHub Copilot: before 1.5.63-243 (fixed in 1.5.63-243)

Published 2026-02-10. Last modified 2026-06-17.