---
id: CVE-2026-114123
title: >-
  D365 F&O MCP Server: Official Azure one-click deployment ships with
  authentication disabled by default, exposing proprietary X++ source over the
  public internet
summary: >-
  D365 F&O MCP Server is a Model Context Protocol server for querying Dynamics
  365 Finance & Operations X++ code and metadata. Prior to version 1.11.0, the
  officially documented Azure one-click deployment uses
  infrastructure/azuredeploy.js…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-306
  - CWE-1188
vendor: dynamics365ninja
product: d365fo-mcp-server
affected:
  - d365fo-mcp-server < 1.11.0
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T16:57:47.278Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114123'
references:
  - url: >-
      https://github.com/dynamics365ninja/d365fo-mcp-server/security/advisories/GHSA-8764-fh3m-wf7g
    label: >-
      https://github.com/dynamics365ninja/d365fo-mcp-server/security/advisories/GHSA-8764-fh3m-wf7g
  - url: >-
      https://github.com/dynamics365ninja/d365fo-mcp-server/commit/384394a81e1c6c1e0149586203395240a38fc818
    label: >-
      https://github.com/dynamics365ninja/d365fo-mcp-server/commit/384394a81e1c6c1e0149586203395240a38fc818
  - url: >-
      https://github.com/dynamics365ninja/d365fo-mcp-server/commit/e70bd051f817ebb652d664b10a944fe2c5495de2
    label: >-
      https://github.com/dynamics365ninja/d365fo-mcp-server/commit/e70bd051f817ebb652d664b10a944fe2c5495de2
  - url: 'https://github.com/dynamics365ninja/d365fo-mcp-server/releases/tag/v1.11.0'
    label: 'https://github.com/dynamics365ninja/d365fo-mcp-server/releases/tag/v1.11.0'
tags:
  - cve.org
ingestedAt: '2026-10-21T18:09:27.285Z'
---

## Overview

D365 F&O MCP Server is a Model Context Protocol server for querying Dynamics 365 Finance & Operations X++ code and metadata. Prior to version 1.11.0, the officially documented Azure one-click deployment uses infrastructure/azuredeploy.json and infrastructure/main.bicep to default the apiKey parameter to an empty string and pass it to the App Service API_KEY setting. With API_KEY unset or empty, src/middleware/apiKeyAuth.ts passes requests through without authentication, while src/index.ts binds the HTTP listener to 0.0.0.0 by default. If the deployer leaves the optional key blank and does not add separate network restrictions or upstream authentication, the resulting public App Service allows unauthenticated JSON-RPC tools/call requests to /mcp. The deployment's MCP_SERVER_MODE=read-only setting does not prevent anonymous access to read/search tools, including search, get_object_info, batch_get_info, extension_info, security_info, find_references, and find_event_handlers, exposing indexed proprietary X++ source snippets and metadata. Exposed information can include business logic, extension and event-handler wiring, security-role and privilege structure, and labels originally indexed from PackagesLocalDirectory. Deployments protected by a configured API key, effective upstream authentication, or network restrictions preventing attacker access are outside this unauthenticated exposure scenario. This issue is fixed in version 1.11.0.

## Affected

- `d365fo-mcp-server < 1.11.0`

## Remediation

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