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Windows DNS EUVDEUVD-2026-44053

| CVE-2026-50465 HIGH
Improper Access Control (CWE-284)
2026-07-14 microsoft GHSA-r27q-6qv6-4wqh
7.1
CVSS 3.1 · Vendor: microsoft
Temporal: 6.2
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Severity by source

Vendor (microsoft) PRIMARY
7.1 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CIRCL (temporal)
6.2 MEDIUM
cvss
vuln.today AI
7.1 HIGH

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).

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 20:14 vuln.today
CVE Published
Jul 14, 2026 - 17:07 nvd
HIGH 7.1

DescriptionCVE.org

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

Access
Obtain low-privileged local access to DNS host
Exploit
Abuse improper access control on DNS service
Execution
Tamper with DNS records or disrupt service
Impact
Degrade name resolution integrity and availability

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. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-44053 vulnerability details – vuln.today

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