middleBrick vs Nessus

middleBrick is a black-box API security scanner that submits requests and analyzes responses without requiring code access, agents, or SDK integration. It supports any language, framework, or cloud and completes a scan in under a minute using read-only methods plus text-only POST for LLM probes. Nessus is a network and host vulnerability scanner focused on infrastructure, operating systems, and known software vulnerabilities, using authenticated checks and extensive plugin sets.

For API security, middleBrick maps findings to OWASP API Top 10 (2023), covering authentication bypass, injection probes limited to text-based methods, SSRF indicators, and unsafe consumption patterns. Nessus does not specialize in API-specific semantics such as JWT validation, OpenAPI contract mismatches, or business logic; it identifies network and system-level weaknesses that may be indirectly related.

Setup cost for middleBrick is effectively zero at the Free tier, with no on-premise deployment required and minimal configuration. Nessus typically requires on-premise or cloud appliances, licensing, and ongoing maintenance, which increases initial setup complexity.

middleBrick detects 12 categories aligned to OWASP API Top 10, including authentication misconfigurations, BOLA and BFLA, property authorization over-exposure, and input validation issues such as CORS wildcard and dangerous HTTP methods. It also surfaces data exposure patterns like emails, card Luhn validity, SSN-like values, API key formats, and error leakage, plus encryption and SSRF indicators relevant to API endpoints.

OpenAPI analysis is a core capability: middleBrick parses OpenAPI 3.0, 3.1, and Swagger 2.0 with recursive $ref resolution and cross-references spec definitions against runtime findings. This highlights undefined security schemes, deprecated operations, and missing pagination that may indicate contract drift.

Nessus does not parse API contracts or validate OpenAPI specifications. Its API-related coverage is limited and generally indirect, focusing on transport security, outdated software, and network exposure rather than request and response semantics.

Authenticated scanning in middleBrick supports Bearer, API key, Basic auth, and cookies, with a domain verification gate to ensure only domain owners enable credentialed tests. Header forwarding is restricted to an allowlist for controlled testing.

middleBrick maps findings to PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023), using direct language for those three frameworks. For other regulations, the tool aligns with security controls described in or supports audit evidence for relevant requirements, without claiming certification or compliance guarantees.

The scanner is read-only and does not perform active SQL injection or command injection testing, which fall outside its scope. It does not fix, patch, block, or remediate findings; it reports with remediation guidance. Business logic vulnerabilities and blind SSRF are not detected, and it is not intended to replace a human pentester for high-stakes audits.

Nessus provides broad infrastructure vulnerability coverage, including OS patches, configuration issues, and some application-layer checks. It does not offer API-specific compliance mappings to OWASP API Top 10 or contract-aware analysis.

middleBrick offers a Web Dashboard for scanning, viewing reports, tracking score trends, and downloading branded compliance PDFs. The CLI enables commands such as middlebrick scan <url> with JSON or text output. A GitHub Action provides CI/CD gating, failing the build when the score drops below a configurable threshold. An MCP Server allows scanning from AI coding assistants, and a programmable API supports custom integrations.

Pro tier adds continuous monitoring with scheduled rescans every 6 hours, daily, weekly, or monthly. Diff detection highlights new findings, resolved findings, and score drift, with email alerts rate-limited to one per hour per API. HMAC-SHA256 signed webhooks can auto-disable after five consecutive failures.

Nessus has a wide range of integrations, agents, and add-ons for IT operations, patch management, and compliance reporting. Its monitoring focuses on infrastructure state rather than API contract changes or authentication drift.

middleBrick pricing tiers include Free at zero cost for 3 scans per month with CLI access; Starter at 99 USD per month for 15 APIs, monthly scans, dashboard, email alerts, and MCP Server; Pro at 499 USD per month for 100 APIs with continuous monitoring, GitHub Action gates, and compliance reports; and Enterprise at 2000 USD per month for unlimited APIs, custom rules, SSO, audit logs, and dedicated support. Pricing is subscription-based with clear feature differentiation.

The tool targets developers and security teams who need lightweight, API-first security validation integrated into CI/CD and developer workflows. It is suitable for organizations that prioritize API contract testing and runtime behavior analysis without invasive scanning.

Nessus pricing varies by platform and plugin bundles, typically involving per-host or mixed device licensing. It targets IT and infrastructure teams responsible for network and system-wide vulnerability management rather than API-centric development pipelines.