CVE-2026-54130

critical

Description

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130

Details

Source: Mitre, NVD

Published: 2026-06-18

Updated: 2026-06-24

CVSS v3

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

EPSS: 0.00504