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18/08/2026 3:02 pm
TL;DR: OAuth and SAML solve different problems: OAuth is a delegated authorization framework, while SAML is a federated authentication protocol, according to Ory. For most modern stacks, the practical choice is usually SAML versus OIDC, not SAML versus OAuth, and confusing the layers creates avoidable identity and access design gaps.
NHIMG editorial — based on content published by Ory: OAuth vs SAML: 6 Key Differences Explained
By the numbers:
- Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them.
- NHIs outnumber human identities by 25x to 50x in modern enterprises.
- Only 5.7% of organisations have full visibility into their service accounts.
Questions worth separating out
Q: How should security teams choose between SAML and OIDC?
A: Choose SAML when you need mature enterprise federation for browser-based applications and central assertion handling.
Q: Why do teams get OAuth versus SAML wrong so often?
A: Because they compare protocols that were built for different jobs.
Q: When should organisations use OIDC instead of plain OAuth?
A: Use OIDC when the application needs a verified user identity, not just permission to call APIs.
Practitioner guidance
- Separate authentication from authorisation in architecture reviews Document which services need user authentication, which need delegated API access, and which need both.
- Adopt OIDC for modern login flows If teams are using plain OAuth for sign-in, require an explicit review of whether OIDC is the correct protocol.
- Preserve SAML where enterprise federation is already embedded Keep SAML where legacy applications, regulated partner integrations, or existing IdP ecosystems depend on it.
What's in the full article
Ory's full article covers the protocol-level implementation detail this post intentionally leaves for the source:
- Step-by-step explanation of OAuth flows, token issuance, and validation decisions across modern application architectures.
- A fuller breakdown of SAML assertion handling, XML complexity, and federation behaviour in enterprise IdP environments.
- The article's decision framework for when teams should choose SAML, OAuth, or OIDC across different stack patterns.
- Examples of hybrid deployments where SAML SSO and OAuth or OIDC coexist in the same identity programme.
👉 Read Ory's guide to the key differences between OAuth, SAML, and OIDC →
OAuth vs SAML: what IAM teams need to choose for modern stacks?
Explore further
18/08/2026 3:41 pm
OAuth versus SAML is a layer mismatch, not a protocol choice. Security teams create avoidable design errors when they frame delegated access and federated authentication as alternatives. OAuth solves authorisation, SAML solves authentication, and the governance question is which boundary each one should own. The practitioner takeaway is to stop asking one protocol to cover both layers.
A few things that frame the scale:
- Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them, according to Ultimate Guide to NHIs.
- 91.6% of secrets remain valid five days after the targeted organisation is notified, showing how slowly credential risk is removed in practice.
A question worth separating out:
Q: What is the difference between SAML and OIDC for access control?
A: SAML relies on XML assertions exchanged between an identity provider and a relying party, while OIDC uses tokens on top of OAuth 2.0 to convey identity. In practice, SAML usually fits enterprise SSO more naturally, while OIDC fits modern application and API environments with less implementation overhead.
👉 Read our full editorial: OAuth vs SAML: why identity teams should compare SAML with OIDC
