EUVD-2026-56739
GHSA-xr3j-v8qw-3594
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local vector and high-privilege prerequisite confirmed by description ('authorized attacker') and CVSS; full impact triplet reflects post-escalation system control.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
No cwe for this issue in Windows DNS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows DNS affects a broad range of Windows client and server operating systems, enabling an already-authenticated local attacker to gain elevated privileges on the target system. The CVSS vector (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) indicates the attacker requires high existing privileges - consistent with the description's reference to an 'authorized attacker' - yet can achieve full confidentiality, integrity, and availability impact post-exploitation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an attacker to already hold high-privilege local access (PR:H per CVSS vector) on the affected Windows system - the description uses the term 'authorized attacker,' confirming some form of pre-existing elevated access is a prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The 6.7 CVSS base score reflects the constrained threat model: AV:L requires local presence, and PR:H requires the attacker to already hold high privileges on the system - a significant limiting factor that substantially reduces real-world attack surface compared to network-vector, unauthenticated vulnerabilities. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft-released patches via Windows Update or WSUS; each affected product line has a specific target build: Windows 10 1607 and Server 2016 should be updated to build 10.0.14393.9418 or later, Windows 10 1809 and Server 2019 to 10.0.17763.9115 or later, Windows 10 21H2 to 10.0.19044.7663 or later, Windows 10 22H2 to 10.0.19045.7663 or later, Windows 11 23H2 to 10.0.22631.7517 or later, Windows 11 24H2 and Server 2025 to 10.0.26100.9168/33296 or later, Windows 11 25H2 to 10.0.26200.9168 or later, Windows 11 26H1 to 10.0.28000.2704 or later, and Server 2022 to 10.0.20348.5499 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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