Microsoft Copilot vulnerabilities

6 CVEs affecting Microsoft Copilot, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-55946, published 2026-09-17.

More from Microsoft.

Highest priority

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

• CVE-2026-24301, published 2026-08-18. High severity, CVSS 7.5. EPSS: 4.1% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.
• CVE-2026-26136, published 2026-03-19. High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.
• CVE-2026-42824, published 2026-06-04. High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
• CVE-2026-45497, published 2026-06-04. High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an authorized attacker to execute code over a network.
• CVE-2026-55145, published 2026-07-14. High severity, CVSS 7.1. EPSS: 0.5% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in Outlook Copilot allows an authorized attacker to perform tampering over a network.
• CVE-2026-55946, published 2026-09-17. Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days. Ai command injection in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.