---
id: CVE-2026-55944
title: >-
  Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On
  Premises) Remote Code Execution Vulnerability
summary: >-
  Deserialization of untrusted data in Microsoft Dynamics NAV allows an
  unauthorized attacker to execute code over a network.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/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 NAV 2018
affected:
  - dynamics_nav_2018 >= 1.0 < 11.0.50704.0
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-07-14T18:01:05.898620Z'
published: '2026-07-14'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T22:33:09.372Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-55944'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55944'
    label: >-
      Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On
      Premises) Remote Code Execution Vulnerability
tags:
  - cve.org
epss: 0.01532
epssPercentile: 0.73669
ingestedAt: '2026-09-08T17:06:31.907Z'
---

## Overview

Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.

## Affected

- `dynamics_nav_2018 >= 1.0 < 11.0.50704.0`

## Remediation

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