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Give each MCP server and tool only the access it needs, protect credentials with secure storage and careful authorization, and restrict what local servers can do. For remote servers, authenticate protected requests at the HTTP boundary; for local servers, limit filesystem and network access. Review permissions and tool definitions again when they change.
Start with a permission inventory
Before approving a server, make its access understandable and reviewable. Record what the server is for, which data sources it can reach, which tools it exposes, and what each tool needs to read or change. Separate servers that handle sensitive data—such as authentication, payments, or personally identifiable information—from general-purpose servers where practical.
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Map each tool to the minimum access it needs
- Grant only the read, write, and resource permissions required for that tool’s job.
- Prefer narrow OAuth scopes and credentials scoped to one server over shared credentials with broad access.
- Explain clearly what a server can read or change before approval. For sensitive or destructive calls, show the full tool parameters and require human approval.
- Review scope changes periodically and whenever a server adds capabilities. OWASP identifies secret exposure and privilege escalation through scope creep as MCP risks.
Protect remote MCP endpoints
If a remote endpoint exposes non-public tools or data, require authentication and enforce authorization on every protected request. For OAuth over HTTP, follow the MCP OAuth profile and identify the intended MCP resource. Validate the token’s issuer, signature, expiry, and intended audience as required by the authorization flow in use. Reject invalid tokens, and never forward an MCP access token as an upstream API credential.
Choose where authorization applies
The MCP Apps authorization guide describes two implementation patterns. They differ in how much of a server is protected; either way, enforce the decision where the HTTP request arrives, before an unauthorized call reaches the MCP server.
#1 Best Overall
| Approach | Protected surface | When it fits | Unauthorized request behavior |
|---|---|---|---|
| Per-server authorization | Every request to the server requires a valid bearer token. | Simpler when all server tools are sensitive. | Reject at the HTTP boundary; the guide describes an HTTP 401 challenge. |
| Per-tool authorization | Only calls to designated protected tools are challenged; public tools may remain available. | When a server needs both public and protected tools. | Challenge a protected call before it reaches the MCP server; the guide’s example uses HTTP 401 with a WWW-Authenticate challenge. |
These are patterns in an implementation guide, not a guarantee that every client, SDK, or server supports both. A tool’s own error response is not a substitute for rejecting an unauthorized HTTP request. Check that the component enforcing policy actually sees every protected request. Also use TLS, validate request origins and hostnames, and apply rate limits, quotas, and timeouts.
Keep API keys and OAuth credentials out of exposed places
Do not put API keys, client secrets, or OAuth tokens in source code, plaintext MCP configuration, application settings, model prompts, tool output, or diagnostic logs. Store OAuth access and refresh tokens in the operating system’s secure credential store—for example, macOS Keychain, Windows Credential Manager, or Linux Secret Service. Redact secrets and personal data from logs.
Prefer scoped credentials and safe collection
- Use short-lived, narrowly scoped credentials where available. Rotate or revoke a credential if exposure is suspected.
- If a server needs a user’s credential for a third-party API, do not ask the user to paste it into a model conversation. Prefer a browser-based flow when the client and server support one.
- The MCP project’s November 2025 announcement describes URL mode elicitation as a browser-based credential collection option in which the server manages the resulting credential, so the entered value does not pass through the MCP client. Verify implementation support before relying on it.
Constrain local servers and their tools
A local server can still expose files or network access through the machine running it. Run it in a sandbox or restricted environment, grant access only to required directories, and disable network access unless the server needs it. Use the local stdio transport where appropriate to limit network exposure.
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- Verify the publisher and package, review source code and tool definitions, check package integrity, and scan dependencies.
- Treat tool inputs and outputs as untrusted. Validate them, sanitize paths and commands, and use strict allowlists for tools that fetch URLs to reduce server-side request forgery (SSRF) risk.
- Keep servers isolated from one another and watch for unintended credential or data flows between them.
- Monitor tool schemas: an approved server’s definitions can change. Review changes and ask users to approve new or changed capabilities.
Log activity without leaking sensitive data
Record tool invocations with user context and timestamps, and send operational logs to monitoring where appropriate. Remove secrets and personal data before logging. Alert on unusual tool calls or access patterns, and review server behavior and permissions regularly. When tool definitions change, request consent again rather than relying on the original approval.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the MCP authorization version your deployment implements
The MCP project’s July 28, 2026 announcement for specification version 2026-07-28 describes several authorization changes: authorization servers should return the RFC 9207 iss parameter, and clients must validate it before redeeming an authorization code; client credentials are bound to the issuer that minted them; and Dynamic Client Registration (DCR) is formally deprecated in favor of Client ID Metadata Documents (CIMD), while remaining available for backward compatibility at the time of the announcement.
That announcement is not a substitute for checking the current normative specification and the SDK actually deployed. Confirm the relevant revision and support in your client and server before changing an authorization flow; an announced protocol change is not proof that a particular implementation has adopted it.
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