CVE-2026-54130

M365 Copilot Information Disclosure Vulnerability

Published: Jun 18, 2026Updated: Jun 22, 2026 Sources: CVE List NVDCWE-306

NVD MITRE

9.8CVSSCRITICAL

Description

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

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-306

Affected Products

Microsoft 365 Copilot Microsoft

On-prem

Operating Systems / windows

microsoftcommercialUSOperating Systems

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques

Initial Access

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References

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

msrc.microsoft.com

Timeline

Published

Jun 18, 2026

Last Updated

Jun 22, 2026

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