EUVD-2026-73889
GHSA-4j4j-2wjq-mxqj
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local symlink attack requiring an existing user session (AV:L/PR:L), no timing barrier (AC:L), no user interaction, full SYSTEM-level impact within the same machine boundary (S:U).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
7DescriptionCVE.org
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.
AnalysisAI
Symlink following (CWE-59) in the Windows Update Stack enables a locally authenticated attacker with standard user privileges to elevate to SYSTEM on multiple Windows 11 and Windows Server 2025 builds. The vulnerability is confirmed actively exploited per CISA KEV, with full confidentiality, integrity, and availability impact following privilege escalation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid local or domain user account on the target system (PR:L; standard user, not guest). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CISA KEV confirms active in-the-wild exploitation, establishing this as a genuine, urgent priority. … 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 immediately via Windows Update or Microsoft Update Catalog - given confirmed active exploitation per CISA KEV, this warrants emergency patching priority. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and prioritize all Windows 11 and Windows Server 2025 systems within your environment, beginning with internet-facing and critical-tier infrastructure; simultaneously apply vendor-released patches to isolated test systems to validate compatibility before broad deployment. …
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Same weakness CWE-59 – Improper Link Resolution Before File Access
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External POC / Exploit Code
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