EUVD-2026-73429
GHSA-j4v3-fjg7-v94h
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low privileges required; no interaction needed; full SYSTEM-level C/I/A impact via overflow in privileged LSASS process.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Stack-based buffer overflow in Microsoft's Local Security Authority Server (lsasrv.dll) enables a locally authenticated attacker with standard user privileges to escalate to SYSTEM-level access on affected Windows systems. The flaw spans the entire modern Windows ecosystem - from Windows Server 2012 through Windows 11 26H1 and Windows Server 2025 - making it broadly applicable in enterprise environments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing authenticated local session on the target Windows system with at least standard user privileges (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately captures this vulnerability's threat model: it requires an existing local foothold but imposes no further complexity barrier once present. … 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 Microsoft's security update via Windows Update or WSUS to bring affected systems to the patched build versions listed in the affected products section. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and catalog all affected Windows systems (Windows Server 2012-2025, Windows 11 26H1 and earlier) and prioritize domain controllers, privilege-management servers, and security tools. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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