Alternatives to 42Crunch for Backend engineers

middleBrick is a self-service API security scanner that requires no agents, SDKs, or build-time instrumentation. You submit a target URL and receive a risk score from A to F along with prioritized findings. The scanner operates as a black-box probe using only read-only methods (GET and HEAD) plus text-only POST for LLM probes, which means it works with any language, framework, or cloud environment without requiring changes to your codebase.

The scanner covers 12 security categories aligned to OWASP API Top 10 (2023). It detects authentication bypasses and JWT misconfigurations such as alg=none, weak algorithms, expired tokens, and missing claims. Other areas include BOLA and IDOR via sequential ID enumeration, BFLA and privilege escalation through admin endpoint probing, property authorization over-exposure, input validation issues like CORS wildcard usage and dangerous HTTP methods, rate limiting and resource consumption signals, data exposure patterns including PII and API key leakage, encryption misconfigurations, SSRF indicators, inventory management gaps, unsafe consumption surfaces, and LLM/AI security adversarial probes across tiered scan depths.

middleBrick parses OpenAPI 3.0, 3.1, and Swagger 2.0 documents with recursive $ref resolution, cross-referencing spec definitions against runtime behavior to identify undefined security schemes, sensitive fields, deprecated operations, and missing pagination. Authenticated scanning supports Bearer, API key, Basic auth, and Cookie methods, gated by domain verification (DNS TXT or HTTP well-known file) so only domain owners can scan with credentials. A strict header allowlist limits forwarded headers to Authorization, X-API-Key, Cookie, and X-Custom-*.

Pro tier enables scheduled rescans at intervals of six hours, daily, weekly, or monthly, with diff detection to highlight new findings, resolved findings, and score drift. Alerts are delivered via email at a rate-limited frequency of one per hour per API, and HMAC-SHA256 signed webhooks can be configured with auto-disable after five consecutive failures. Integration options include a web dashboard for managing scans and reports, a CLI via the middlebrick npm package, a GitHub Action for CI/CD gating, and an MCP server for use with AI coding assistants.

middleBrick does not fix, patch, block, or remediate findings; it detects and reports with remediation guidance. It does not perform active SQL injection or command injection testing, as those require intrusive payloads outside the scanner’s scope. The tool does not detect business logic vulnerabilities, blind SSRF relying on out-of-band infrastructure, or replace a human pentester for high-stakes audits. These boundaries help you plan complementary testing methods rather than assuming full coverage from a single tool.