SAMLJWTassertie

SAMLJWTassertie describes an interoperability pattern in identity and access management in which JSON Web Tokens (JWT) are used to carry or translate the claims contained in SAML 2.0 assertions. It is not a formal standard, but a descriptive label for approaches that enable SAML-based identities to be consumed by JWT-based ecosystems, such as OAuth 2.0, OpenID Connect, or API gateways.

Two common patterns exist. In a SAML-to-JWT bridge, a SAML identity provider issues a SAML assertion to a user. A gateway or security service validates the SAML assertion, extracts the subject and attributes, and issues a signed JWT that the relying party accepts. In a JWT-to-SAML bridge, an API gateway or service provider consumes a valid JWT and issues a SAML 2.0 assertion to a downstream service that expects SAML. In both cases, careful claim mapping is required to align SAML attributes (such as NameID and attributes) with JWT claims (sub, email, groups).

Security and operational considerations include ensuring trust boundaries, robust signature verification, and certificate management for both SAML and JWT, as well as replay protection, appropriate token lifetimes, and secure transport. Attribute privacy and minimization should be applied to avoid leaking unnecessary data. Systems should log translation events for auditing and monitor for drift or misconfiguration.

Use cases include enterprise migrations from SAML to JWT-based ecosystems, bridging SSO across applications with differing token formats, and enabling API access control for legacy services while leveraging modern identity platforms.