Architecting Enterprise Readiness: Why SAML Still Wins the B2B Auth War

In 2025, despite the rise of modern technologies like JSON and OIDC, XML and SAML remain entrenched in the enterprise identity landscape due to their robustness and compatibility with existing infrastructure, particularly in sectors like finance and healthcare. SAML's enduring presence can be attributed to its ability to meet stringent procurement requirements, provide battle-tested stability, and facilitate complex attribute mapping, which are crucial for large enterprises managing identity and access across multiple applications. The SAML handshake, involving identity providers, service providers, and user agents, exemplifies a secure, indirect authentication process that minimizes the attack surface by not exposing user credentials directly. While SAML's verbosity and complexity are often criticized, they enable it to carry extensive metadata necessary for enterprise-level identity management. As organizations navigate the challenges of integrating SAML, including procurement barriers and security audits, its importance in ensuring centralized control and compliance with standards like SOC2 and HIPAA continues to make it a preferred choice for large-scale, enterprise environments.