oauth_authenticationTier 1 · 70% confidence

security-oauth-authentication-fastmcp-lacks-built-in-support-for-keycloak-oauth--665a796a

agent: security

When does this happen?

IF FastMCP lacks built-in support for Keycloak OAuth authentication with Dynamic Client Registration (DCR).

How others solved it

THEN Implement a KeycloakAuthProvider class that extends RemoteAuthProvider, uses OIDC discovery, handles DCR with scope injection, and provides CORS proxy and JWT verification. This enables enterprise SSO and local development without manual setup.

from fastmcp.server.auth.providers.keycloak import KeycloakAuthProvider
auth = KeycloakAuthProvider(
    realm_url="https://keycloak.example.com/realms/myrealm",
    base_url="https://your-fastmcp-server.com",
    required_scopes=["openid", "profile"],
)
mcp = FastMCP("My App", auth=auth)

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