PT-2026-50802 · Microsoft · M365 Copilot

Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-54130

NVD

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Fix

Missing Authentication

Weakness Enumeration

CWE-306

Related Identifiers

CVE-2026-54130

Affected Products

M365 Copilot

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-54130 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130 · Vendor Advisory