Microsoft 365 Copilot vulnerabilities

54 CVEs affecting Microsoft 365 Copilot, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-85887, published 2026-09-18.

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Highest priority

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

• CVE-2025-53766, published 2025-08-12. Critical severity, CVSS 9.8. EPSS: 8.2% chance of exploitation in the next 30 days. Heap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code over a network.
• CVE-2025-32711, published 2025-06-11. High severity, CVSS 7.5. EPSS: 8% chance of exploitation in the next 30 days. Ai command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.
• CVE-2025-60724, published 2025-11-11. Critical severity, CVSS 9.8. EPSS: 6.3% chance of exploitation in the next 30 days. Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
• CVE-2025-30388, published 2025-05-13. High severity, CVSS 7.8. EPSS: 4.4% chance of exploitation in the next 30 days. Heap-based buffer overflow in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
• CVE-2021-43905, published 2021-12-15. Critical severity, CVSS 9.6. EPSS: 3% chance of exploitation in the next 30 days. Microsoft Office app Remote Code Execution Vulnerability
• CVE-2026-50517, published 2026-07-24. Critical severity, CVSS 9.9. EPSS: 1.7% chance of exploitation in the next 30 days. Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
• CVE-2025-26687, published 2025-04-08. High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days. Use after free in Windows Win32K - GRFX allows an unauthorized attacker to elevate privileges over a network.
• CVE-2026-54130, published 2026-06-18. High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days. Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
• CVE-2026-24307, published 2026-01-22. High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days. Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
• CVE-2026-42827, published 2026-05-22. 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.

Latest

• CVE-2026-85887, published 2026-09-18. High severity, CVSS 7.7. EPSS: 0.8% chance of exploitation in the next 30 days. Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
• CVE-2026-85885, published 2026-09-17. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an authorized attacker to elevate privileges over a network.
• CVE-2026-58617, published 2026-07-14. Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days. Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.
• CVE-2026-50387, published 2026-07-14. High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days. Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.
• CVE-2026-48561, published 2026-07-14. Critical severity, CVSS 9.6. EPSS: 0.9% chance of exploitation in the next 30 days. Improper neutralization of special elements used in a command ('command injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to execute code over a network.
• CVE-2026-41106, published 2026-07-02. Critical severity, CVSS 9.3. EPSS: 0.7% chance of exploitation in the next 30 days. Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privileges over a network.
• CVE-2026-47645, published 2026-06-19. High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days. Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.
• CVE-2026-42895, published 2026-06-19. High severity, CVSS 7.5. EPSS: 0.7% 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 perform tampering over a network.