Improper Authorization in Windows and Windows Server - CVE-2026-58540

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Main Vulnerability Database Vulnerabilities #VU138148

Improper Authorization in Windows and Windows Server - CVE-2026-58540

Published: July 17, 2026


Vulnerability identifier: #VU138148
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-58540
CWE-ID: CWE-285
Exploitation vector: Local access
Exploit availability: No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server

Detailed vulnerability description

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to improper authorization in Windows Installer when handling local installer operations. A local user can perform crafted local actions to escalate privileges.


How to mitigate CVE-2026-58540

Install security update from vendor's website.

Sources