EUVD-2026-73166
GHSA-qg75-h4g4-wwvf
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local UAF LPE requiring standard-user access and race-condition precision (AC:H); successful SYSTEM escalation warrants full C:H/I:H/A:H impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Installer via a use-after-free (CWE-416) allows an authenticated user with standard privileges to achieve SYSTEM-level code execution across a broad range of Windows client and server releases. The vulnerability is confirmed by Microsoft MSRC and affects every major supported Windows version from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user account with at minimum standard (low) privileges on the target system, confirmed by CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.0 captures a meaningful but bounded risk profile: exploitation requires authenticated local access (PR:L, AV:L) and high attack complexity (AC:H), which reflects the non-trivial heap manipulation or timing window that UAF exploitation typically demands. … 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 Microsoft patches via Windows Update, WSUS, or Microsoft Endpoint Configuration Manager; the exact patched build numbers per OS version are enumerated in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62694. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems in your environment, specifically identifying those running Windows 10 (version 1607 and later), Windows 11 (all versions), and Windows Server 2012-2025. …
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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