EUVD-2026-56391
GHSA-4m32-vgh8-h3gw
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged attacker exploits DHCP Server symlink flaw with no complexity or interaction; full system impact but no scope change beyond the vulnerable host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Improper link resolution before file access ('link following') in Windows DHCP Server allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows DHCP Server affects all major Windows Server releases from 2012 through 2025, as well as Windows 10 versions 1607 and 1809. An authorized low-privileged local attacker can exploit a symlink-following flaw (CWE-59) during DHCP Server file access operations to gain full control (C:H/I:H/A:H) over the affected system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized, low-privileged local account on the target Windows Server host (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects the real-world risk profile: exploitation requires local, low-privileged access with no user interaction and no special attack complexity, yielding full confidentiality, integrity, and availability impact on the vulnerable system. … 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 | The primary remediation is to apply Microsoft's released security update, which brings affected systems to the following fixed builds: Windows Server 2025 to 10.0.26100.33296 or later; Windows Server 2022 to 10.0.20348.5499 or later; Windows Server 2019 to 10.0.17763.9115 or later; Windows Server 2016 to 10.0.14393.9418 or later; Windows Server 2012 R2 to 6.3.9600.23337 or later; Windows Server 2012 to 6.2.9200.26279 or later; and Windows 10 1607/1809 to the corresponding build floors above. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an urgent asset inventory to identify all systems running affected Windows Server versions (2012, 2012 R2, 2016, 2019, 2022, 2025) or Windows 10 (1607, 1809) with DHCP Server enabled; prioritize DHCP servers accessible to non-administrative users or in network-critical paths for access restrictions. …
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External POC / Exploit Code
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