PublicCVE

CVE-2026-50517

CRITICAL9.9Insecure deserialization

Description

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

CVSS breakdown

CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
E
Unchanged
RL
O
RC
Changed
Updated 20m ago · 8 sources