middleBrick vs Nuclei

middleBrick is a black-box API security scanner that submits requests to a live endpoint and analyzes responses. It does not require access to source code, agents, or SDKs and supports any language or framework. The tool limits itself to read-only methods and text-only POST probes for LLM endpoints. Nuclei relies heavily on template-based payloads and supports a wide range of protocol modules, including many intrusive checks that require a higher level of access and explicit configuration to avoid disruption.

middleBrick detects issues across 12 categories aligned to OWASP API Top 10 (2023), including authentication bypass, authorization flaws, input validation, data exposure, and LLM/AI security probes. Findings map to PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10. Nuclei provides broad protocol coverage with many community templates; users should validate which specific checks align with their compliance requirements and understand that coverage does not imply certification or compliance guarantees.

Setup with middleBrick requires submitting a URL and, for authenticated scans, domain verification via DNS TXT record or an HTTP well-known file. Only approved headers are forwarded, and credentials are stored only for the duration of the scan. Nuclei can be installed locally or run via containers and supports a wide array of input sources and authentication methods, which increases flexibility but also requires more configuration to manage safely and consistently.

middleBrick parses OpenAPI 3.0, 3.1, and Swagger 2.0 with recursive $ref resolution, cross-referencing the spec against runtime behavior to highlight undefined security schemes or missing pagination. It offers multiple integration paths including a web dashboard, CLI via an npm package, a GitHub Action for CI/CD gating, an MCP server for AI-assisted workflows, and a programmable API. Nuclei provides a CLI-first experience with YAML templates and a large ecosystem of third-party templates; integration into CI/CD requires additional scripting around exit codes and reporting.

middleBrick offers a free tier with 3 scans per month and CLI access, a Starter plan at 15 APIs with dashboard and email alerts, a Pro plan with continuous monitoring and CI/CD integration, and an Enterprise tier for unlimited APIs and custom rules. Nuclei uses a license-based model with community and paid tiers; users should compare the included scan volume, API limits, and support options against their expected workload and operational overhead.

middleBrick does not fix, patch, or block findings; it reports with remediation guidance. It does not perform active SQL injection or command injection testing, does not detect business logic vulnerabilities, and does not perform blind SSRF testing. It is not a replacement for a human pentester in high-stakes assessments. Nuclei users should similarly validate that their scan scope matches objectives and that findings are reviewed in context before remediation.