Runtime SSO Callback Configurator for Self-Hosted SaaS
Self-hosted SaaS teams keep hitting SSO callback problems when apps are deployed behind reverse proxies or load balancers. Prowler's issue and related discussion show that changing a SAML ACS URL can require rebuilding a frontend container because browser-exposed Next.js variables were baked at build time. The opportunity is a runtime SSO callback configuration and verification layer that helps self-hosted operators avoid custom image builds for common auth deployment differences.
Problem Statement
A self-hosted operator may have a working app until SAML/OAuth is enabled behind a proxy. The browser callback URL can point to an internal container hostname instead of the public domain, and in frontend frameworks the relevant value may already be compiled into the image. The current workaround is to rebuild or customize images, update compose files, and retest auth manually, which is high-friction for teams that just want SSO to work with their existing reverse proxy.
The Idea
Build a runtime SSO callback configurator for self-hosted SaaS operators who need SAML/OAuth URLs, reverse-proxy domains, and container settings to stay correct without rebuilding frontend images.
Why Now
Modern open-source SaaS apps increasingly ship Docker images and Next.js frontends, while buyers expect SAML/OIDC to work behind their own domains, proxies, and load balancers. In March and April 2026, Prowler users raised that the documented workaround for ACS URL mismatch requires custom frontend builds, and the feature request was later closed as not planned. That gap creates room for a cross-app tool that detects and validates auth callback deployment mismatches before rollout.
Target User
Platform engineers, DevSecOps teams, and IT administrators running self-hosted SaaS behind reverse proxies or load balancers.
Target Market
Self-hosted SaaS authentication operations for security, compliance, and internal-tool deployments.
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