intent-solutions-io/validating-cors-policies
010-archive/backups-20251108/skill-structure-cleanup-20251108-073936/plugins/security/cors-policy-validator/skills/cors-policy-validator/SKILL.md
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.
$ install --global
skillsauthnpx skillsauth add intent-solutions-io/plugins-nixtla validating-cors-policiesInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Jun 5, 2026, 7:06 AM12.2s4 files scanned
SKILL.md
- name:
- validating-cors-policies
- description:
- |
- allowed-tools:
- Read, WebFetch, WebSearch, Grep
- version:
- 1.0.0
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
- Analyze CORS Configuration: The skill receives the CORS configuration details, such as headers or policy files.
- Validate Policy: It utilizes the cors-policy-validator plugin to analyze the provided configuration against established security best practices.
- 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:
- Read the
cors_policy.jsonfile. - Use the cors-policy-validator plugin to analyze the CORS configuration.
- 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:
- Fetch the CORS headers from the specified API endpoint.
- Use the cors-policy-validator plugin to analyze the headers.
- 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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