validating-cors-policies
This skill enables Claude to validate Cross-Origin Resource Sharing (CORS) policies. It uses the cors-policy-validator plugin to analyze CORS configurations and identify potential security vulnerabilities. Use this skill when the user requests to "validate CORS policy", "check CORS configuration", "analyze CORS headers", or asks about "CORS security". It helps ensure that CORS policies are correctly implemented, preventing unauthorized cross-origin requests and protecting sensitive data.
Best use case
validating-cors-policies is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
This skill enables Claude to validate Cross-Origin Resource Sharing (CORS) policies. It uses the cors-policy-validator plugin to analyze CORS configurations and identify potential security vulnerabilities. Use this skill when the user requests to "validate CORS policy", "check CORS configuration", "analyze CORS headers", or asks about "CORS security". It helps ensure that CORS policies are correctly implemented, preventing unauthorized cross-origin requests and protecting sensitive data.
Teams using validating-cors-policies should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/cors-policy-validator/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How validating-cors-policies Compares
| Feature / Agent | validating-cors-policies | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
This skill enables Claude to validate Cross-Origin Resource Sharing (CORS) policies. It uses the cors-policy-validator plugin to analyze CORS configurations and identify potential security vulnerabilities. Use this skill when the user requests to "validate CORS policy", "check CORS configuration", "analyze CORS headers", or asks about "CORS security". It helps ensure that CORS policies are correctly implemented, preventing unauthorized cross-origin requests and protecting sensitive data.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
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SKILL.md Source
## Overview This skill empowers Claude to assess the security and correctness of CORS policies. By leveraging the cors-policy-validator plugin, it identifies misconfigurations and potential vulnerabilities in CORS settings, helping developers build more secure web applications. ## How It Works 1. **Analyze CORS Configuration**: The skill receives the CORS configuration details, such as headers or policy files. 2. **Validate Policy**: It utilizes the cors-policy-validator plugin to analyze the provided configuration against established security best practices. 3. **Report Findings**: The skill presents a detailed report outlining any identified vulnerabilities or misconfigurations in the CORS policy. ## When to Use This Skill This skill activates when you need to: - Validate a CORS policy for a web application. - Check the CORS configuration of an API endpoint. - Identify potential security vulnerabilities in existing CORS implementations. ## Examples ### Example 1: Validating a CORS Policy File User request: "Validate the CORS policy in `cors_policy.json`" The skill will: 1. Read the `cors_policy.json` file. 2. Use the cors-policy-validator plugin to analyze the CORS configuration. 3. Output a report detailing any identified vulnerabilities or misconfigurations. ### Example 2: Checking CORS Headers for an API Endpoint User request: "Check CORS headers for the API endpoint at `https://example.com/api`" The skill will: 1. Fetch the CORS headers from the specified API endpoint. 2. Use the cors-policy-validator plugin to analyze the headers. 3. Output a report summarizing the CORS configuration and any potential issues. ## Best Practices - **Configuration Source**: Always specify the source of the CORS configuration (e.g., file path, URL) for accurate validation. - **Regular Validation**: Regularly validate CORS policies, especially after making changes to the application or API. - **Heuristic Analysis**: Consider supplementing validation with manual review and heuristic analysis to catch subtle vulnerabilities. ## Integration This skill can be integrated with other security-related plugins to provide a more comprehensive security assessment. For example, it can be used in conjunction with vulnerability scanning tools to identify potential cross-site scripting (XSS) vulnerabilities related to CORS misconfigurations.
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