CVE-2026-50517

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

Score

CVSS 3.1 9.9 Critical

Status

Analyzed - secure@microsoft.com

Published

2026-07-24

Last modified

2026-10-28

Weaknesses

CWE-502

Affected products

• 365 Copilot (Microsoft)

References

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