PT-2026-58331 · Microsoft · Install Service+1

Published 2026-07-14 · Updated 2026-07-15 · CVE-2026-50343

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Microsoft Install Service (affected versions not specified)

Description Improper privilege management in the Microsoft Install Service allows an authorized attacker to elevate privileges locally, potentially granting full control over the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

CVE-2026-50343

Affected Products

Install Service

Windows

References · 5

• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-50343 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-50343 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-50343 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50343 · Vendor Advisory
• https://twitter.com/windowsforum/status/2077271226045661513 · Twitter Post