---
id: "CVE-2026-119903"
page: "https://infrastack.ai/live/CVE-2026-119903"
kind: "vulnerability"
aliases: ["CVE-2026-119903"]
title: "Windows Installer: access control flaw lets a local user gain higher privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "windows", "windows-installer"]
not_affected_if: ["no-local-untrusted-users"]
published_at: "2026-11-10T19:20:10+00:00"
first_seen_at: "2026-11-10T19:25:02+00:00"
updated_at: "2026-11-10T19:40:18+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119903", "first_seen_at": "2026-11-10T19:25:02+00:00"}]
exploit_sources: []
---

# Windows Installer: access control flaw lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-119903 (this .md is for agents)

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.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Windows build with `winver` and compare it to the fixed build named in Microsoft's advisory for CVE-2026-119903 (unknown in the sources)
- Check Windows Update history for the matching security update (unknown in the sources)

## Timeline

- 2026-11-10T19:25:02+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119903

## From the sources

Improper access control in Windows Installer allows an authorized attacker to elevate privileges locally.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_