PT-2026-58653 · Microsoft · Windows Installer+1

CVE-2026-58540 · Published 2026-07-14 · Updated 2026-07-15

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 Windows Installer (affected versions not specified)

Description Improper authorization in Windows Installer allows an authorized attacker to elevate privileges locally, which can lead to an elevation-of-privilege impact on the system.

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

Improper Authorization

Weakness Enumeration

CWE-285

Related Identifiers

CVE-2026-58540

Affected Products

Windows

Windows Installer

References · 5

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58540 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-58540 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-58540 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-58540 · Security Note
• https://twitter.com/windowsforum/status/2077499484053905765 · Twitter Post