The Difficulties of SAML Single Logout
On the technical and UX issues of single logout implementations.
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- 2026-10-10
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SAML: A Fractal of Bad Design blog.trailofbits.com
“SAML is being crushed under the weight of its own complexity.” The author lists five flaws that compound: “1. Built on XML; 2. Canonicalization; 3. Enveloped signatures; 4. 'Kitchen-sink' design; 5. Ossification.” So instead of one more mitigation, identity providers get a…
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SAML is insecure by design joonas.fi
Not only weird, SAML is also insecure by design, as it relies on signatures based on XML canonicalization, not XML byte stream. Which means you can exploit XML parser/encoder differences.
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The Difference Between SAML 2.0 and OAuth 2.0 ubisecure.com
“Even though SAML was actually designed to be widely applicable, its contemporary usage is typically shifted towards enterprise SSO scenarios. On the other hand, OAuth was designed for use with applications on the Internet, especially for delegated authorisation.”
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SAML vs. OAuth web.archive.org
“OAuth is a protocol for authorization: it ensures Bob goes to the right parking lot. In contrast, SAML is a protocol for authentication, or allowing Bob to get past the guardhouse.”
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IAM › SAML: “On the technical and UX issues of single logout implementations.”