EUVD-2026-73810
GHSA-7xvr-j8j3-8r6h
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access required, low-privilege account sufficient, high complexity for UAF heap-grooming; full C/I/A reflects SYSTEM-level control post-exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Security Health Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Security Health Service (a core Windows security monitoring component) allows a locally authenticated attacker with standard user privileges to gain SYSTEM-level access via a use-after-free memory corruption flaw. Affected platforms span Windows 11 (24H2, 25H2, 26H1) and Windows Server 2022/2025 - all fully patched by Microsoft's latest cumulative updates. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated local session on the target system - the attacker must be able to log in interactively or via RDP with at minimum a standard (low-privilege) user account (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H appropriately reflects the primary risk envelope: local access is mandatory, exploitation complexity is high (typical for UAF race-condition exploitation requiring precise heap manipulation), and a low-privilege authenticated account is the minimum bar. … 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 cumulative update that brings affected systems to or above the following build numbers: Windows 11 24H2 → 10.0.26100.9445, Windows 11 25H2 → 10.0.26200.9445, Windows 11 26H1 → 10.0.28000.2954, Windows Server 2022 → 10.0.20348.5622, Windows Server 2025 (including Server Core) → 10.0.26100.33438. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2022/2025 systems in your environment using asset management tools. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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