---
title: IdP-initiated SSO
sidebar_custom_props:
    termName: IdP-initiated SSO
    tags:
        - SAML
    shortDescription: SSO flow started at the Identity Provider.
    longDescription: User launches from the IdP without an SP AuthnRequest. The IdP posts a response directly to the SP's ACS; simpler to start but offers fewer request-bound security guarantees.
---
