Microsoft GitHub Copilot vulnerabilities

4 CVEs affecting Microsoft GitHub Copilot, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-50510, published 2026-07-14.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2025-66389, published 2026-06-22. High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days. GitHub Copilot 1.372.0 allows filesystem access outside of a workspace folder (without user approval) via a file-handler URI parameter to fetch_webpage. Therefore, exfiltration could occur if there…
• CVE-2026-21516, published 2026-02-10. 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.
• CVE-2025-64671, published 2025-12-09. High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in Copilot allows an unauthorized attacker to execute code locally.
• CVE-2026-50510, published 2026-07-14. High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days. Improper restriction of names for files and other resources in Github Copilot allows an unauthorized attacker to execute code locally.