Xss Prevention

What it does

This skill equips AI agents to identify and neutralize Cross-Site Scripting (XSS) vulnerabilities within web applications. It scans input fields, URLs, and output contexts to detect malicious scripts before they can execute or compromise user data.

When to use it

• Securely processing untrusted user inputs in forms or search bars.
• Validating data before rendering it on dynamic web pages.
• Auditing codebases for potential injection flaws during development.
• Hardening APIs that accept external payloads or parameters.

Key capabilities

• Detects script tags and event handler attributes (e.g., onclick, onerror).
• Identifies dangerous characters like <, >, ", ', and &.
• Flags encoded obfuscation techniques used to bypass filters.
• Provides recommendations for sanitization or encoding strategies.

Example prompts

• "Analyze this HTML snippet for XSS vulnerabilities: <img src=x onerror=alert(1)>"
• "How should I sanitize user input from a comment form before storing it in the database?"
• "Review these API request parameters and highlight any potential injection risks."

Tips & gotchas

Ensure the AI agent has access to the specific context of where data is being rendered (e.g., HTML vs. JavaScript) for accurate vulnerability assessment. While this skill identifies risks, it does not automatically patch code; manual review or integration with dedicated security libraries is often required for full protection.