EUVD-2026-73894
GHSA-h46c-c7gr-qfvq
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector with low complexity and low privileges required matches a standard authenticated LPE; full CIA impact reflects SYSTEM-level control post-exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows WebClient Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation via use-after-free in the Windows WebClient (WebDAV client) Service affects virtually every supported Windows desktop and server release, from Server 2012 through Windows 11 and Server 2025. An authenticated local attacker with standard user privileges can exploit the memory-safety flaw to achieve full SYSTEM-level control, gaining complete confidentiality, integrity, and availability over the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have an existing authenticated local session on the target Windows machine - any standard (non-privileged) user account suffices, matching CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | With a CVSS 3.1 score of 7.8 (High) and a vector of AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, this is a classic high-priority local privilege escalation. … 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 patches via Windows Update or WSUS/SCCM immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems running versions 2012 through 2025 and identify those exposed to standard users or external access; prioritize production and externally-facing systems. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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