OAuth vs SAML 2026

Two protocols. Different use cases.

OAuth/OIDC

OAuth and SAML are the two dominant federated identity protocols. They look similar from a distance (both let one system trust another to authenticate users) and behave very differently up close. Picking the right one for a given integration matters; using both where each fits is what mature platforms do.

What OAuth and OIDC offer:

• Modern, JSON-based protocol.: OAuth 2.0 is the authorization framework; OIDC is the authentication layer built on top. Both use JSON tokens (JWTs in OIDC), HTTP-based flows, and modern crypto. The protocol is straightforward to implement and well-supported across languages.
• Mobile-friendly.: OAuth flows handle native mobile apps cleanly. PKCE (Proof Key for Code Exchange) is the standard for mobile and SPA flows; the protocol handles the security challenges of these clients without requiring shared secrets that the client can leak.
• API access pattern.: OAuth's primary use case is delegated authorization for APIs. The user logs in once; downstream APIs receive scoped tokens that grant specific permissions. The pattern matches the way modern multi-service applications actually work.
• Consumer applications.: Login with Google, Apple, GitHub, Microsoft. Every consumer application uses OAuth/OIDC because the user already has an identity at one of the major providers. The protocol is the universal lingua franca for consumer identity.
• Token-based, refreshable.: Access tokens are short-lived (minutes to hours); refresh tokens issue new access tokens without re-authenticating the user. The pattern matches the security model of zero-trust: no long-lived credentials, frequent rotation, easy revocation.

OAuth/OIDC is the right default for new authentication integrations. The ecosystem is large; the libraries are mature; the security properties match modern threat models.

SAML

SAML is the older protocol and remains the dominant choice in enterprise SSO. The XML-based format and the dated tooling make it feel ancient compared to OIDC, but the enterprise install base is enormous and most large customers expect SAML support.

• Enterprise SSO standard.: Workday, Salesforce, Microsoft Active Directory Federation Services, and most enterprise IDPs (Okta, Azure AD, Ping) speak SAML fluently. Integration with these is faster via SAML than via OIDC for many enterprise customers.
• Mature ecosystem.: SAML has been the enterprise default since the mid-2000s. The libraries, tools, and patterns are extensive. The protocol's complexity is documented and the failure modes are well-understood.
• Web SSO use case.: SAML's primary use case is browser-based SSO. The user authenticates once at the IDP; the IDP issues a SAML assertion that the application validates; the user is logged in. The flow is web-centric and works less well for native or mobile clients.
• Older B2B integrations.: Long-running B2B platforms often have customers whose IT teams expect SAML. Adding OIDC as the only option blocks integrations with these customers. SAML support is part of being enterprise-ready.
• XML-based, complex.: The XML signing and encryption rules are notoriously easy to misimplement. SAML implementations have had a long history of vulnerabilities (XML signature wrapping, comment injection, DTD attacks). Use battle-tested libraries; do not build your own SAML implementation.

SAML is the right choice when integrating with enterprise IDPs that mandate it. It is the wrong choice for new consumer applications or for service-to-service authentication.

Decide

The decision is not "pick one and reject the other." Mature platforms support both because their customers and use cases span both worlds. The choice per integration is what matters.

• OAuth/OIDC for new integrations.: When the choice is open (new consumer app, new B2B SaaS, new internal service), pick OIDC. The ecosystem is healthier; the protocol is simpler; the security properties are stronger. Default to it unless a specific reason pushes you elsewhere.
• SAML for legacy enterprise customers.: Some enterprise customers will not (or cannot) integrate via OIDC. Their IDP only supports SAML; their security team only approves SAML; their IT team only knows SAML. For those customers, support SAML; do not try to push them to OIDC.
• Both have a place.: The platform supports OAuth/OIDC for the modern path and SAML for the legacy enterprise path. Customers pick the protocol that matches their environment. The platform team maintains both implementations.
• SCIM for provisioning, regardless.: Whichever authentication protocol you pick, use SCIM (System for Cross-domain Identity Management) for user provisioning. The auth protocol authenticates; SCIM creates and deletes user accounts. The two layers cover different needs.
• Audit both implementations.: Both SAML and OIDC have well-known implementation pitfalls. Annual security review of both, including penetration testing of the authentication flow, catches the misconfigurations that produce real-world breaches.

OAuth/OIDC and SAML are not competing protocols; they are complementary tools for different integration patterns. Nova AI Ops integrates with both authentication paths, audits the configuration of each, and surfaces the integration patterns across the customer base so the team can see which protocols are most used and where the security posture might need attention.