CVE-2026-114123 D365 F&O MCP Server is a Model Context Protocol server for querying Dynamics 365 Finance & Operations X++ code and metadata.
- Exploited in the wild
- Not known
- Fix
- None listed
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.
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.
Sources
Also known as GHSA-8764-fh3m-wf7g.