Migrating from 42Crunch to middleBrick for OAuth 2.0 provider validation

When validating an OAuth 2.0 provider, you submit a URL or endpoint set and rely on the tool to assess configuration and behavior. 42Crunch provides a risk score and a set of findings, but it does not expose raw request and response pairs in a way that invites deep protocol inspection. You receive categorized results with recommendations, yet reconstructing the exact validation flow often requires additional tooling or manual replay to confirm redirect handling, token introspection behavior, and scope enforcement.

middleBrick shifts the workflow from a vendor-centric scan to an investigator-centric one. You submit the provider endpoint and receive a risk score from A to F along with prioritized findings mapped to OAuth 2.0 concerns such as redirect URI validation, token exposure, and scope handling. The scanner follows links and forms where safe, using read-only methods and text-only probes, producing concise evidence you can trace to specific checks. Because it is black-box, you can validate behavior without forking or deploying agents, and the scan completes in under a minute.

The tool detects issues aligned with common OAuth 2.0 misconfigurations, including open redirects, implicit flow remnants, weak state parameter usage, and overly permissive scopes. Findings highlight whether redirect URIs are strictly validated, whether authorization codes or tokens appear in logs or error messages, and whether PKCE is enforced where applicable. Each finding includes remediation guidance, such as exact redirect validation patterns and secure parameter handling, enabling engineering teams to implement fixes without chasing vague descriptions.

• Redirect URI exact-match validation.
• State parameter presence and integrity checks.
• PKCE enforcement for public clients.
• Token leakage in URLs or logs.
• Scope validation and least-privilege enforcement.

Unlike a tightly coupled SaaS workflow, middleBrick operates as a standalone scanning interface that returns structured results you can integrate into existing validation pipelines. You will need to rebuild any custom gates that relied on 42Crunch proprietary formats, but you gain flexibility in how you consume findings. The CLI supports JSON output for automated checks, and the GitHub Action can fail a build based on score or specific issue thresholds. If you used dashboard tracking or scheduled scans, the Pro tier replaces them with configurable monitoring, diffing between runs, and email or webhook alerts.

middlebrick scan https://oauth.example.com --output json

Authenticated scanning is supported via Bearer token, API key, Basic auth, or cookie, with domain verification to ensure only the domain owner can submit credentials. The scanner forwards a limited allowlist of headers, preserving security while validating provider behavior under realistic conditions.

middleBrick maps findings to OWASP API Top 10 (2023), which helps you prepare audit evidence for security reviews aligned with that framework. It also surfaces findings relevant to PCI-DSS 4.0 and SOC 2 Type II control validation for API surfaces. The tool does not perform intrusive exploitation, does not fix or patch systems, and does not replace a human pentester for high-stakes audits. To migrate effectively, inventory your OAuth 2.0 endpoints, define your acceptance thresholds for score and issue severity, and run a baseline scan before integrating the scanner into CI/CD or monitoring workflows.