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Vulnerability record · CVE-2026-54130 · published 18 June 2026

CVE-2026-54130: Microsoft 365 copilot missing authentication for critical function vulnerability

Microsoft · 365 Copilot

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

7.5 CVSS 3.1 High EPSS 1.1% · top 36.1% CWE-306 · Missing authentication for critical function
7.5CVSS 3.1 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
25 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2026-50517Microsoft 365 copilot deserialization of untrusted data vulnerabilityDeserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.EPSS 1.7%9.8CVE-2026-58617Microsoft 365 copilot improper access control vulnerabilityImproper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.EPSS 0.79%9.8CVE-2025-60724Microsoft 365 copilot heap-based buffer overflow vulnerabilityHeap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.EPSS 5.9%9.8CVE-2025-53766Microsoft 365 copilot heap-based buffer overflow vulnerabilityHeap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code over a network.EPSS 8.0%9.6CVE-2026-48561Microsoft 365 copilot command injection vulnerabilityImproper neutralization of special elements used in a command ('command injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker …EPSS 0.86%9.6CVE-2021-43905Microsoft 365 copilot vulnerabilityMicrosoft Office app Remote Code Execution VulnerabilityEPSS 2.8%9.3CVE-2026-41106Microsoft 365 copilot open redirect vulnerabilityUrl redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privileges over a network.EPSS 0.72%9.3CVE-2026-41090Microsoft 365 copilot command injection vulnerabilityImproper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform t…EPSS 0.76%

Source: NIST National Vulnerability Database (record CVE-2026-54130), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.