---
id: CVE-2026-70321
title: Microsoft SharePoint Remote Code Execution Vulnerability
summary: >-
  Deserialization of untrusted data in Microsoft Office SharePoint allows an
  authorized attacker to execute code over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-502
vendor: Microsoft
product: Microsoft SharePoint Server Subscription Edition
affected:
  - sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20522
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-07T00:00:00+00:00'
published: '2026-08-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T16:24:51.072Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-70321'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70321'
    label: Microsoft SharePoint Remote Code Execution Vulnerability
tags:
  - cve.org
epss: 0.01281
epssPercentile: 0.68763
ingestedAt: '2026-09-08T19:08:49.658Z'
---

## Overview

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

## Affected

- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20522`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.