---
id: "CVE-2026-96027"
page: "https://infrastack.ai/live/CVE-2026-96027"
kind: "vulnerability"
aliases: ["CVE-2026-96027"]
title: "Windows Installer: use-after-free lets a local user gain higher privileges"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "local-privilege-escalation", "windows", "windows-installer"]
not_affected_if: ["no-local-untrusted-users", "patched-nov-2026"]
published_at: "2026-11-10T19:21:59+00:00"
first_seen_at: "2026-11-10T19:25:27+00:00"
updated_at: "2026-11-10T20:06:00+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96027", "first_seen_at": "2026-11-10T19:25:27+00:00"}, {"source": "analyst", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-96027", "first_seen_at": "2026-11-10T20:06:00+00:00", "cites": ["https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-96027"]}]
exploit_sources: []
---

# Windows Installer: use-after-free lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-96027 (this .md is for agents)

A use-after-free bug in Windows Installer lets a local user who is already authorized on the machine raise their privileges. The sources give no further detail on the exact trigger or the affected Windows builds.

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

## How to check

Check Windows Update history for the November 2026 cumulative update (released 2026-11-10); the KB and fixed build numbers for your Windows version are in the MSRC Security Update Guide entry for CVE-2026-96027 (not yet read).

## Fix

Install the November 2026 (2026-11-10) Windows security update for your Windows version. Exact KB and build: unknown, look up on the MSRC page for CVE-2026-96027.

## Timeline

- 2026-11-10T19:25:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-96027
- 2026-11-10T20:06:00+00:00 analyst https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-96027 — MSRC CVRF API confirms the CVE is in the November 2026 Security Updates (released 2026-11-10). The MSRC advisory page and CVRF bulk document returned no content, so builds and KB numbers are not read. Nothing marked verified.

## Documents

- [advisory] MSRC CVRF: CVE-2026-96027 in November 2026 Security Updates https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-96027

## From the sources

Use after free 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_