What is the CORS Policy Validator skill?

It is a specialized capability for Claude Code that allows the AI to analyze and validate CORS configurations for security flaws, misconfigurations, and compliance issues.

Does it support local configuration file analysis?

Yes, it can read and validate local files like cors_policy.json to ensure your settings are secure before you deploy them to your server or cloud infrastructure.

Can this skill help me fix 'Access-Control-Allow-Origin' errors?

Yes, by analyzing your current configuration, the skill identifies why a request is being blocked and provides the specific header changes needed to fix the issue securely.

How do I check a live API's CORS headers with this skill?

You can simply ask Claude to 'check the CORS headers for https://api.example.com' and the skill will fetch the headers and provide a detailed security report.

CORS Policy Validator

Name: CORS Policy Validator
Author: jeremylongshore

byjeremylongshore

•

884

Security & Testing

Validates Cross-Origin Resource Sharing (CORS) configurations to identify security vulnerabilities and ensure compliant implementation.

About

The CORS Policy Validator skill enables Claude to automatically audit CORS policies by analyzing response headers and configuration files against established security best practices. It helps developers prevent unauthorized cross-origin requests and sensitive data leaks by identifying common misconfigurations, such as overly permissive origins or insecure credential handling, providing actionable reports to strengthen web application security.

Key Features

Static validation of local CORS configuration files (JSON/YAML)
Identification of high-risk settings like wildcard origins
Comprehensive reporting of security vulnerabilities
884 GitHub stars
Automated CORS header analysis from live API endpoints
Actionable remediation advice based on industry standards

Use Cases

Reviewing infrastructure-as-code policy files before deployment
Auditing production API endpoints for security header compliance
Debugging complex CORS errors during frontend-backend integration

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jeremylongshore/claude-code-plugins-plus-skills cors-policy-validator

For use in Claude.ai and ChatGPT

Download Skill

GitHub