CVE-2026-119903 · Infrastructure
NO FIX YET
Windows Installer has an improper access control flaw that lets an attacker who already has a local account raise their privileges. The attacker gets elevated rights on the same machine, which can lead to full control of that system.
first public Nov 10, 2026 · 1 source
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Any Windows machine where a user has a local account can be exposed, since the attacker must already be authorized on the system. The sources do not name the affected Windows builds. Systems where only trusted administrators log in carry lower practical risk.
Not affected if no-local-untrusted-users
Who cares windows, windows-installer
winver and compare it to the fixed build named in Microsoft's advisory for CVE-2026-119903 (unknown in the sources)No fix yet, per the sources.
Improper access control in Windows Installer allows an authorized attacker to elevate privileges locally.
This page as .md · .json · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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