---
id: CVE-2026-65815
title: Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
summary: >-
  Deserialization of untrusted data in Microsoft Dynamics 365 (on-premises)
  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 Dynamics 365 (on-premises) version 9.1
affected:
  - dynamics_365_on-premises_version_9.1 >= 9.0 < 9.1.0047.0006
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-12T03:56:10.129277Z'
published: '2026-08-11'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T20:52:37.253Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-65815'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65815'
    label: Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
tags:
  - cve.org
epss: 0.01694
epssPercentile: 0.77001
ingestedAt: '2026-09-08T18:07:34.896Z'
---

## Overview

Deserialization of untrusted data in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network.

## Affected

- `dynamics_365_on-premises_version_9.1 >= 9.0 < 9.1.0047.0006`

## Remediation

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