Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Requires authenticated low-privileged local access (PR:L, AV:L) with no user interaction; impact is DNS data tampering and service disruption (I:H/A:H) with no data disclosure (C:N).
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Improper access control in Microsoft Windows DNS allows an authorized attacker to perform tampering locally.
AnalysisAI
Local integrity and availability tampering in the Microsoft Windows DNS component affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 (including Server Core), where an authorized attacker with low privileges can abuse improper access control to modify DNS data or disrupt the service. Microsoft self-reported the issue and has released a patch. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be an authenticated, low-privileged local user on a system running the affected Windows DNS component (PR:L, AV:L, UI:N) - the CVSS vector confirms local access and no user interaction are needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.1 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H) describes a locally exploitable, low-complexity flaw requiring low privileges and no user interaction, with high integrity and availability impact but no confidentiality loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with a low-privileged but authenticated foothold on a Windows Server 2025 machine hosting the DNS role (for example, via a compromised service account or a standard user on a shared host) leverages the improper access control to alter DNS records or disrupt the DNS service, redirecting or denying name resolution for clients that depend on it. Given AV:L/AC:L, the action is straightforward once local access exists, but no public proof-of-concept has been identified at time of analysis. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50465 to all affected Windows 11 (24H2/25H2/26H1) and Windows Server 2025 systems, including Server Core installations, using the KB listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50465. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems, including Server Core deployments, to identify exposure. …
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44053
GHSA-r27q-6qv6-4wqh