---
id: "CVE-2026-112989"
page: "https://infrastack.ai/live/CVE-2026-112989"
kind: "vulnerability"
aliases: ["CVE-2026-112989"]
title: "Windows Servicing Stack: local privilege escalation via untrusted pointer (Windows 11 24H2/25H2/26H2, Server 2025)"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows 11 Version 24H2", "fixed": ["10.0.26100.9974"], "affected": ">= 10.0.26100.0, < 10.0.26100.9974", "ecosystem": "vendor"}, {"name": "Windows 11 Version 25H2", "fixed": ["10.0.26200.9974"], "affected": ">= 10.0.26200.0, < 10.0.26200.9974", "ecosystem": "vendor"}, {"name": "Windows 11 Version 26H2", "fixed": ["10.0.26300.9974"], "affected": ">= 10.0.26300.0, < 10.0.26300.9974", "ecosystem": "vendor"}, {"name": "Windows Server 2025", "fixed": ["10.0.26100.33822"], "affected": ">= 10.0.26100.0, < 10.0.26100.33822", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["infrastructure", "local-privilege-escalation", "self-hosted", "servicing-stack", "windows", "windows-11", "windows-server-2025"]
not_affected_if: ["no-local-accounts"]
published_at: "2026-11-10T19:18:51+00:00"
first_seen_at: "2026-11-10T19:24:37+00:00"
updated_at: "2026-11-10T23:58:33+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112989", "first_seen_at": "2026-11-10T19:24:37+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112989", "first_seen_at": "2026-11-10T23:58:33+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-112989", "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-112989"]}]
exploit_sources: []
---

# Windows Servicing Stack: local privilege escalation via untrusted pointer (Windows 11 24H2/25H2/26H2, Server 2025)

Link for people: https://infrastack.ai/live/CVE-2026-112989 (this .md is for agents)

Untrusted pointer dereference (CWE-822) in Servicing Stack Updates lets an authorized local user gain higher privileges. Microsoft rates it CVSS 7.0 (AV:L/AC:H/PR:L). Per the NVD record carrying Microsoft's data, it affects Windows 11 24H2, 25H2, 26H2 and Windows Server 2025, including Server Core. No exploitation or public PoC found.

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

## Affected

- vendor:Windows 11 Version 24H2 affected >= 10.0.26100.0, < 10.0.26100.9974 fixed 10.0.26100.9974
- vendor:Windows 11 Version 25H2 affected >= 10.0.26200.0, < 10.0.26200.9974 fixed 10.0.26200.9974
- vendor:Windows 11 Version 26H2 affected >= 10.0.26300.0, < 10.0.26300.9974 fixed 10.0.26300.9974
- vendor:Windows Server 2025 affected >= 10.0.26100.0, < 10.0.26100.33822 fixed 10.0.26100.33822

## How to check

Run winver or [System.Environment]::OSVersion in PowerShell and compare the OS build to the fixed builds: Windows 11 24H2 < 10.0.26100.9974, 25H2 < 10.0.26200.9974, 26H2 < 10.0.26300.9974, Windows Server 2025 < 10.0.26100.33822. Confirm against the MSRC page for CVE-2026-112989 (it needs JavaScript).

## Fix

Install the November 2026 Windows security update so the OS build reaches 10.0.26100.9974 (24H2), 10.0.26200.9974 (25H2), 10.0.26300.9974 (26H2) or 10.0.26100.33822 (Server 2025). KB numbers not confirmed.

## Timeline

- 2026-11-10T19:24:37+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112989
- 2026-11-10T23:58:33+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-112989 — NVD (Microsoft CNA data) lists affected Windows 11 24H2/25H2/26H2 and Server 2025 builds with fixed build numbers. MSRC page is JS-only and did not render, so nothing marked verified. No exploitation or PoC found (not in KEV).

## Documents

- [advisory] NVD CVE-2026-112989 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/CVE-2026-112989
- [mentions] MSRC Security Update Guide CVE-2026-112989 (JS-only, did not render) https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-112989

## From the sources

Untrusted pointer dereference in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.

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