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

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Microsoft
  • 365 Copilot

No data.

No data.

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Vendors Products
References
Link Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130 cve-icon
History

Thu, 18 Jun 2026 22:00:00 +0000

Type Values Removed Values Added
Description Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Title M365 Copilot Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft 365 Copilot
Weaknesses CWE-306
CPEs cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft 365 Copilot
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-06-18T21:42:39.358Z

Reserved: 2026-06-11T20:33:37.837Z

Link: CVE-2026-54130

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-19T00:30:17Z