# CVE-2026-114123: D365 F&O MCP Server is a Model Context Protocol server for querying Dynamics 365 Finance & Operations X++ code and metadata.


- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 21 Oct 2026
- **Updated:** 21 Oct 2026
- **Also known as:** GHSA-8764-fh3m-wf7g

## What is CVE-2026-114123?

CVE-2026-114123 is a high-severity vulnerability in dynamics365ninja d365fo-mcp-server, published on 21 Oct 2026. 

### Official description

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.

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-1188 (Initialization of a Resource with an Insecure Default)

## Which versions are affected by CVE-2026-114123?


## How do I fix CVE-2026-114123?

No fix has been published for CVE-2026-114123 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-114123 being exploited?

There is no known exploitation of CVE-2026-114123 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-114123 and fix it if it is affected.

What it is: CVE-2026-114123 is a high-severity vulnerability in dynamics365ninja d365fo-mcp-server, published on 21 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-114123 in the wild and no public exploit code.

Affected product: dynamics365ninja d365fo-mcp-server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-114123/ (Markdown: https://insights.sbomify.com/CVE-2026-114123/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-114123
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-114123
- OSV: https://osv.dev/vulnerability/CVE-2026-114123

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-114123/
Summaries are generated and may contain mistakes; the official description above is the record.