fastapi

Assess security weaknesses in FastAPI applications across DI, middleware, and auth.

846|152|Updated Mar 13, 2026
One-click install
npx skills add https://github.com/xalgord/xalgorix --skill fastapi-xalgord
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: fastapi
Source: https://github.com/xalgord/xalgorix/tree/main/internal/tools/skills/data/frameworks/fastapi
Command: npx skills add https://github.com/xalgord/xalgorix --skill fastapi-xalgord

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Provides security testing guidance for FastAPI applications, focusing on uncovering dependency injection flaws, middleware gaps, and authorization drift across routers.

Core Features & Use Cases

  • Dependency injection assessment across DI graphs and security hooks
  • Middleware gap analysis (CORS, authentication, lifespan, etc.)
  • OpenAPI and route mapping for auth, admin, and file endpoints
  • Use Case: Audit a FastAPI project to discover DI bypasses and unauthorized access between routers

Quick Start

Run a targeted security assessment on a FastAPI project to identify DI weaknesses, middleware misconfigurations, and access-control gaps.

Frequently Asked Questions about fastapi

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I test FastAPI applications for security vulnerabilities?

To test FastAPI security vulnerabilities, you perform static code analysis, inspect OpenAPI schemas, and map runtime endpoints to reveal misconfigurations and insecure patterns across dependency injection, middleware, and auth.

How do I audit FastAPI dependency injection for security bypasses?

Auditing FastAPI dependency injection involves analyzing DI graphs and security hooks to uncover bypasses and unauthorized access between routers, ensuring dependencies enforce proper access controls and authorization.

Can I assess FastAPI middleware gaps like CORS and authentication?

Yes, you can assess FastAPI middleware gaps by analyzing the middleware stack for CORS, authentication, and lifespan misconfigurations to identify missing security layers and insecure patterns.

Does security testing work with ASGI FastAPI projects using multiple routers?

Yes, security testing is applicable to ASGI FastAPI projects with multiple routers, dependencies, and middleware stacks, allowing comprehensive assessment of authorization drift and access-control gaps.

What is the best way to discover unauthorized access between FastAPI routers?

The best way to discover unauthorized access between FastAPI routers is through OpenAPI route mapping and static analysis of auth and admin endpoints to identify authorization drift and DI bypasses.

Why does FastAPI authorization drift occur across routers?

FastAPI authorization drift occurs across routers when dependency injection security hooks and middleware are inconsistently applied, allowing unauthorized access gaps to form as routes are added or modified.