---
id: "CVE-2026-109472"
page: "https://infrastack.ai/live/CVE-2026-109472"
kind: "vulnerability"
aliases: ["CVE-2026-109472"]
title: "Microsoft SharePoint: untrusted data deserialization lets an authorized user run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "vendor"
products: [{"name": "SharePoint Server Subscription Edition", "fixed": ["16.0.20326.20278"], "affected": ">= 16.0.0, < 16.0.20326.20278", "ecosystem": "vendor"}]
ecosystems: []
tags: ["auth-required", "microsoft-office", "self-hosted", "sharepoint", "vendor", "windows"]
not_affected_if: ["managed-hosting", "sharepoint-online"]
published_at: "2026-11-10T19:18:16+00:00"
first_seen_at: "2026-11-10T19:24:24+00:00"
updated_at: "2026-11-11T00:45:18+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109472", "first_seen_at": "2026-11-10T19:24:24+00:00"}, {"source": "analyst", "url": "https://blog.stefan-gossner.com/2026/11/10/sharepoint-security-fixes-released-with-november-2026-pu-and-offered-through-microsoft-update/", "first_seen_at": "2026-11-11T00:45:18+00:00", "cites": ["https://blog.stefan-gossner.com/2026/11/10/sharepoint-security-fixes-released-with-november-2026-pu-and-offered-through-microsoft-update/", "https://nvd.nist.gov/vuln/detail/cve-2026-109472"]}]
exploit_sources: []
---

# Microsoft SharePoint: untrusted data deserialization lets an authorized user run code

Link for people: https://infrastack.ai/live/CVE-2026-109472 (this .md is for agents)

Microsoft's November 2026 update fixes a deserialization of untrusted data flaw (CWE-502) in SharePoint Server Subscription Edition. An authenticated user with low privileges can run code over the network (CVSS 8.8, Microsoft rates it Important). No exploitation or public PoC is reported.

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

## Affected

- vendor:SharePoint Server Subscription Edition affected >= 16.0.0, < 16.0.20326.20278 fixed 16.0.20326.20278

## How to check

In Central Administration > Upgrade and Migration > Check product and patch installation status, or in PowerShell run (Get-SPFarm).BuildVersion. SharePoint Server Subscription Edition below 16.0.20326.20278 is affected.

## Fix

Install the November 2026 security update for SharePoint Server Subscription Edition (KB 5002945), which brings the build to 16.0.20326.20278 or later.

## Timeline

- 2026-11-10T19:24:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109472
- 2026-11-11T00:45:18+00:00 analyst https://blog.stefan-gossner.com/2026/11/10/sharepoint-security-fixes-released-with-november-2026-pu-and-offered-through-microsoft-update/ — MSRC page is JS-only and unreadable here; used CNA (Microsoft) data via NVD and Gossner's Nov 2026 PU blog. Nothing verified. No exploitation or PoC reported, not in KEV.

## Documents

- [describes] SharePoint security fixes released with November 2026 PU https://blog.stefan-gossner.com/2026/11/10/sharepoint-security-fixes-released-with-november-2026-pu-and-offered-through-microsoft-update/
- [describes] NVD CVE-2026-109472 (CNA data from Microsoft) https://nvd.nist.gov/vuln/detail/cve-2026-109472

## From the sources

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

---

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