Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Date: 2026-06
Affected: microsoft/copilot
Attack vector: auth-bypass
Category: vulnerability-disclosure
Severity: Critical
CVE: CVE-2026-42824
CVE-2026-54130
CWE: CWE-306
CWE-77
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N)

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.


Mitigations:

Architectural layers (MAESTRO):