VulnAPI

VulnAPI is a self-hosted dynamic application security testing scanner for REST, OpenAPI, GraphQL, and request-driven APIs. It is aimed at security-minded teams that can operate command-line tooling and want checks embedded in development pipelines. The zero-cost MIT-licensed release offers unusually broad baseline coverage, but its self-managed deployment and telemetry setting deserve attention.

Overview

VulnAPI tests APIs for discovery, authentication, authorization, input-validation, and business-logic weaknesses. The maker says it detects all ten OWASP API Security Top 10 categories out of the box, making it a broad first pass rather than a narrowly focused checker. Teams can tailor scans to their own requirements and environments, which is valuable when standard checks need to reflect an organisation's architecture or risk priorities.

Deployment is self-hosted on Linux, macOS, or Windows, with Docker also supported. That keeps scanning under the user's control and can suit networks where API traffic should remain inside existing infrastructure. It also means the team must handle installation, upgrades, runtime configuration, and the surrounding execution environment.

Key features

Multiple ways to scan

The scanner accepts curl-like CLI requests, OpenAPI contracts, and GraphQL endpoints. Request-oriented scans fit APIs without a maintained specification, while contract and GraphQL inputs support schema-led workflows. Support for REST, OpenAPI, GraphQL, and raw curl-like requests gives mixed API estates a single testing approach, although teams still need suitable targets and definitions for each assessment.

Actionable findings

Reports identify a finding's risk level, vulnerability, description, and affected operation. Each result also includes the request that triggered it and concrete remediation steps in plain English. That context helps developers reproduce and prioritise issues instead of receiving only a category label; the practical value is highest when the team has an owner ready to apply and verify fixes.

Automation and network control

GitHub Actions, GitLab CI, and Jenkins integrations let teams place scans in common CI/CD pipelines. This supports repeatable checks before release or during development, while custom assessments can reflect environment-specific rules. Proxy settings work through HTTP_PROXY or HTTPS_PROXY variables, or a --proxy argument, which is useful when test traffic must pass through an organisational gateway.

Open project practices

Pre-built binaries and installation instructions are provided for all three supported desktop and server operating systems, reducing the effort of getting a scanner running. The repository invites requests for additional vulnerability checks and best practices through issues or pull requests, giving technically involved users a route to influence coverage. VulnAPI collects anonymous scan-count and vulnerability-count data, including severity; users can disable that collection with a command-line flag.

Pricing

Open source (MIT License): free. The plan is free to use, modify, and distribute for educational and testing purposes. There are no paid tiers, seat charges, scan quotas, trial periods, or renewal terms stated. This is the natural fit for teams that can self-host and maintain an open-source scanner, and for organisations that need to adapt the tool rather than buy a managed service. The trade-off is that the plan provides no vendor-hosted operation; infrastructure and upkeep remain with the user.

Platforms

VulnAPI runs on Linux, macOS, and Windows and can be deployed with Docker. Its self-hosted model and CLI orientation fit developer workstations, build agents, and internally managed security environments. GitHub Actions, GitLab CI, and Jenkins are the named pipeline targets.

Who it's for

Choose VulnAPI if your security or engineering team wants broad OWASP API coverage, can run a self-hosted tool, and values scan inputs that range from raw requests to OpenAPI and GraphQL definitions. It is particularly suitable for teams integrating security gates into existing CI/CD systems or tailoring checks to unusual environments. Look elsewhere if you need a hosted console, vendor-operated maintenance, or a packaged service for users who do not manage command-line infrastructure.

Pros and cons

Pros

• Broad baseline: all ten OWASP API Security Top 10 categories are stated as covered out of the box.
• Flexible targets: curl-like requests, OpenAPI contracts, and GraphQL endpoints accommodate different API development practices.
• Developer-ready results: risk, operation, triggering request, plain-English explanation, and remediation steps make findings easier to act on.
• Pipeline reach: named GitHub Actions, GitLab CI, and Jenkins integrations support automated assessment.
• Fully open source: the MIT licence allows free use, modification, and distribution for educational and testing purposes.

Cons

• Self-hosting required: teams must provide and maintain the runtime, rather than relying on a hosted service.
• Operational expertise matters: custom scans and CLI-based workflows reward security engineers comfortable configuring assessments.
• Telemetry is enabled unless changed: anonymous scan and vulnerability counts are collected by default, though a command-line opt-out is provided.

Alternatives

Compare API security testing software for a wider shortlist. Pick 42Crunch API Security Platform instead if you want a paid platform with a free tier, free trial, OpenAPI auditing, vulnerability scans, and automatic fixes across web and extension environments. OWASP Amass is a free, Apache-licensed open-source option for teams whose priority is its framework rather than VulnAPI's API scanning scope. Choose APISec Platform for a freemium hosted or self-hosted route with public API testing, basic simulations, and community support. Automatic API Attack Tool suits users seeking a free MIT-licensed tool built around Java, Gradle, and Swagger 2.0 specifications. Pynt is the better fit when a limited free starter covering up to 10 API endpoints or a paid business service matches your rollout. Consider Schemathesis for an open-source generator that derives tests from OpenAPI and GraphQL schemas. WuppieFuzz is a free open-source REST API fuzzer. AquilaX API Security Scanner is worth considering for a freemium service with unlimited scans, secrets scanning, PII detection, compliance auditing, and CI/CD plus IDE integrations.

Verdict

VulnAPI is a strong choice for security-minded teams that want comprehensive API checks, useful fix guidance, and CI/CD integration without a licence bill. Choose it when self-hosting and operating a configurable CLI scanner are acceptable. Look elsewhere when you need a managed platform, a polished hosted workflow, or support responsibilities carried by a vendor.