CVE-2026-50517

Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517