CVE-2026-50517
CRITICALMicrosoft M365 Copilot Remote Code Execution Vulnerability
Title source: cnaDescription
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
patch
Microsoft M365 Copilot Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517
Scores
CVSS v3
9.9
EPSS
0.0125
EPSS Percentile
66.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-502
Status
published
Products (2)
microsoft/365_copilot
Microsoft/Microsoft 365 Copilot
-
Published
Jul 24, 2026
Tracked Since
Jul 24, 2026