EUVD-2026-56661
GHSA-x3rx-f6pq-cw23
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring authenticated low-privilege session; low complexity symlink race; full CIA impact on the DHCP server host; no scope change.
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
Privilege escalation in Windows DHCP Server allows a locally authenticated attacker to gain SYSTEM-level privileges by exploiting a symlink/link-following flaw (CWE-59). Affected products span Windows Server 2012 through Windows Server 2025 and Windows 10 (1607/1809), all receiving patches in this advisory cycle. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) the Windows DHCP Server role must be installed and running on the target machine - this is not enabled by default on standard Windows installations and is typically present only on designated network infrastructure servers; (2) the attacker must have an authenticated local session with at least low-privilege (PR:L) user rights on that server - remote unauthenticated exploitation is not possible per the AV:L vector; (3) the attacker must be able to create symbolic links or directory junctions in a file path accessible to the DHCP service, which on modern Windows requires the SeCreateSymbolicLinkPrivilege (granted by default to local admins, and in some configurations to standard users). … 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, score 7.8) accurately reflects a local, low-complexity, low-privilege attack with full CIA impact - consistent with a symlink race that requires only a standard user session on a machine running the DHCP Server role. … 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 vendor-released patch as documented in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62776 and the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-62776. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an asset inventory to identify all Windows Server 2012, 2016, 2019, 2022, and 2025 systems, as well as Windows 10 (1607, 1809) installations, that have the DHCP Server role enabled and document their criticality and dependencies. …
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External POC / Exploit Code
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