Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.
Date: 2026-05
Affected: microsoft/365_copilot
Attack vector: auth-bypass
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-41100
CWE: CWE-284
CVSS: 4.4 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)

Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.


Mitigations:

Architectural layers (MAESTRO):