EUVD-2026-37946
GHSA-9cqp-hgpj-49wr
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Network-reachable function with missing authentication (PR:N, AC:L, UI:N) yields high confidentiality disclosure only, with no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
7DescriptionNVD
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in Microsoft 365 Copilot lets a remote, unauthenticated attacker reach a security-critical function that lacks an authentication check, exposing confidential data over the network. Classified CWE-306 (Missing Authentication for Critical Function) and rated CVSS 7.5, the flaw was reported by Microsoft and a vendor patch is available; there is no public exploit identified at time of analysis, though CISA's SSVC framework flags the issue as automatable with total technical impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Per the CVSS vector (AV:N/AC:L/PR:N/UI:N), no special conditions are required - remote unauthenticated exploitation of the Microsoft 365 Copilot network-facing service, with no user interaction. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed and warrant a measured priority rather than emergency response. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker sends crafted requests over the network to a Copilot function that fails to verify authentication, causing the service to return confidential information without valid credentials. No user interaction or prior access is needed per the CVSS vector, and SSVC marks the issue automatable, so requests could be scripted; however, no public exploit code has been identified at time of analysis. |
| Remediation | Patch available per vendor advisory: Microsoft has released a fix for CVE-2026-54130, documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Confirm patch availability from Microsoft security advisories; inventory all M365 Copilot deployments and affected user counts. …
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External POC / Exploit Code
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