Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130
Source: Mitre, NVD
Published: 2026-06-18
Updated: 2026-06-24
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical
EPSS: 0.00504