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frontend-mobile-security-xss-scan

You are a frontend security specialist focusing on Cross-Site Scripting (XSS) vulnerability detection and prevention. Analyze React, Vue, Angular, and vanilla JavaScript code to identify injection poi

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@sickn33

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Frontend XSS Vulnerability Scanning Skill

Skill Overview


This is a security analysis skill focused on detecting frontend code XSS (cross-site scripting) vulnerabilities. It supports static security audits for React, Vue, Angular, and native JavaScript projects.

Use Cases


  • Code Review Stage: Automatically identify potential security risks during code submission or PR review, helping developers quickly spot dangerous DOM manipulation patterns.

  • Pre-Deployment Detection: Perform comprehensive security scans on upcoming frontend projects to ensure no XSS attack vectors are missed.

  • Framework Migration or Refactoring: When migrating from older frameworks or doing large-scale refactoring, systematically check whether new code uses unsafe HTML rendering methods.

    • Core Capabilities


  • Static Code Analysis: Automatically scan the frontend codebase to identify XSS risk points such as innerHTML, dangerouslySetInnerHTML, v-html, etc., and display them categorized by severity.

  • Framework-Specific Detection: Conduct deep analysis of security features in popular frameworks such as React, Vue, and Angular—for example, detecting dangerous rendering in React that is not sanitized with DOMPurify.

  • Security Reports and Fix Recommendations: Generate detailed reports that include the vulnerability location, risk level, CWE ID, and specific code examples for fixes to help developers understand and resolve issues quickly.

    • Common Questions

    What is an XSS vulnerability, and why should it be detected?


    XSS (cross-site scripting) is a common web security vulnerability. Attackers inject malicious scripts into web pages to steal user data or perform unauthorized actions. Frontend XSS vulnerabilities are especially dangerous because they execute directly in the user’s browser. Timely detection and remediation of these vulnerabilities is critical to ensuring web application security.

    What does the scan output include?


    Each scan generates a structured report containing: the number and locations of vulnerabilities (file name and line number), risk level (from low to severe), vulnerability type (e.g., unsafe HTML manipulation, URL injection, etc.), the corresponding CWE ID, and specific code repair examples.

    How do I fix the detected XSS vulnerabilities?


    Fix methods vary depending on the vulnerability type. For scenarios that require rendering HTML, sanitize using the DOMPurify library; for pure text content, use textContent instead of innerHTML; for URL handling, validate protocols and block javascript: and data: protocols. The report includes safe code examples for each vulnerability type.