CVE-2026-41090: Microsoft 365 Copilot

Critical severity, CVSS 9.3. EPSS: 0.8% 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.

Affected products

• Microsoft 365 Copilot: affected versions not specified

Published 2026-05-22. Last modified 2026-07-23.