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CVE-2026-50343

HighPublished

Microsoft Install Service Elevation of Privilege Vulnerability

Published: Jul 14, 2026
Updated: Sep 17, 2026
Assigning CNA: microsoft
Evidence observed: Aug 6, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 22.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.

Sources

CVE-2026-50343-InstallService-EoPExploit
CVE-2026-50343 InstallService StaticPluginMap EoP - standard user to SYSTEM

Responsible use

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