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url-scheme-validation

Official

Securely validate and sanitize URLs.

Software Engineering#security#sanitization#url validation#whitelist#scheme validation#malicious url
Authorkreuzberg-dev
Version1.0.0
Installs0

System Documentation

What problem does it solve?

This Skill prevents security vulnerabilities by validating and sanitizing URLs, ensuring that only safe and expected schemes are processed, and blocking potentially malicious inputs.

Core Features & Use Cases

  • Scheme Extraction: Identifies the protocol (e.g., http, javascript) from a given URL.
  • Dangerous Scheme Blocking: Prevents the use of unsafe schemes like javascript:, vbscript:, and data: (when blocked).
  • Bypass Detection: Detects and neutralizes attempts to circumvent security through URL encoding.
  • Whitelist Enforcement: Allows only explicitly permitted schemes such as http, https, mailto, ftp, tel, and sms, along with relative URL formats.
  • Use Case: When processing user-provided links in a web application, this Skill ensures that only legitimate URLs are accepted, preventing cross-site scripting (XSS) attacks or unauthorized file access.

Quick Start

Sanitize the provided URL 'javascript:alert("XSS")' to ensure it is safe for use.

Dependency Matrix

Required Modules

None required

Components

Standard package

💻 Claude Code Installation

Recommended: Let Claude install automatically. Simply copy and paste the text below to Claude Code.

Please help me install this Skill:
Name: url-scheme-validation
Download link: https://github.com/kreuzberg-dev/html-to-markdown/archive/main.zip#url-scheme-validation

Please download this .zip file, extract it, and install it in the .claude/skills/ directory.
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