Frontend mobile security xss scan

Skill ranbot-ai/awesome-skills/skills/frontend-mobile-security-xss-scan

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npx -y skills add ranbot-ai/awesome-skills --skill frontend-mobile-security-xss-scan

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What its author says it does

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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

SKILL.md

5.4 KB, as published. Nobody here has run it

XSS Vulnerability Scanner for Frontend Code

Use this skill when

Working on xss vulnerability scanner for frontend code tasks or workflows
Needing guidance, best practices, or checklists for xss vulnerability scanner for frontend code

Do not use this skill when

The task is unrelated to xss vulnerability scanner for frontend code
You need a different domain or tool outside this scope

Context

The user needs comprehensive XSS vulnerability scanning for client-side code, identifying dangerous patterns like unsafe HTML manipulation, URL handling issues, and improper user input rendering. Focus on context-aware detection and framework-specific security patterns.

Requirements

$ARGUMENTS

Instructions

1. XSS Vulnerability Detection

Scan codebase for XSS vulnerabilities using static analysis:

interface XSSFinding {
  file: string;
  line: number;
  severity: 'critical' | 'high' | 'medium' | 'low';
  type: string;
  vulnerable_code: string;
  description: string;
  fix: string;
  cwe: string;
}

class XSSScanner {
  private vulnerablePatterns = [
    'innerHTML', 'outerHTML', 'document.write',
    'insertAdjacentHTML', 'location.href', 'window.open'
  ];

  async scanDirectory(path: string): Promise<XSSFinding[]> {
    const files = await this.findJavaScriptFiles(path);
    const findings: XSSFinding[] = [];

    for (const file of files) {
      const content = await fs.readFile(file, 'utf-8');
      findings.push(...this.scanFile(file, content));
    }

    return findings;
  }

  scanFile(filePath: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];

    findings.push(...this.detectHTMLManipulation(filePath, content));
    findings.push(...this.detectReactVulnerabilities(filePath, content));
    findings.push(...this.detectURLVulnerabilities(filePath, content));
    findings.push(...this.detectEventHandlerIssues(filePath, content));

    return findings;
  }

  detectHTMLManipulation(file: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];
    const lines = content.split('\n');

    lines.forEach((line, index) => {
      if (line.includes('innerHTML') && this.hasUserInput(line)) {
        findings.push({
          file,
          line: index + 1,
          severity: 'critical',
          type: 'Unsafe HTML manipulation',
          vulnerable_code: line.trim(),
          description: 'User-controlled data in HTML manipulation creates XSS risk',
          fix: 'Use textContent for plain text or sanitize with DOMPurify library',
          cwe: 'CWE-79'
        });
      }
    });

    return findings;
  }

  detectReactVulnerabilities(file: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];
    const lines = content.split('\n');

    lines.forEach((line, index) => {
      if (line.includes('dangerously') && !this.hasSanitization(content)) {
        findings.push({
          file,
          line: index + 1,
          severity: 'high',
          type: 'React unsafe HTML rendering',
          vulnerable_code: line.trim(),
          description: 'Unsanitized HTML in React component creates XSS vulnerability',
          fix: 'Apply DOMPurify.sanitize() before rendering or use safe alternatives',
          cwe: 'CWE-79'
        });
      }
    });

    return findings;
  }

  detectURLVulnerabilities(file: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];
    const lines = content.split('\n');

    lines.forEach((line, index) => {
      if (line.includes('location.') && this.hasUserInput(line)) {
        findings.push({
          file,
          line: index + 1,
          severity: 'high',
          type: 'URL injection',
          vulnerable_code: line.trim(),
          description: 'User input in URL assignment can execute malicious code',
          fix: 'Validate URLs and enforce http/https protocols only',
          cwe: 'CWE-79'
        });
      }
    });

    return findings;
  }

  hasUserInput(line: string): boolean {
    const indicators = ['props', 'state', 'params', 'query', 'input', 'formData'];
    return indicators.some(indicator => line.includes(indicator));
  }

  hasSanitization(content: string): boolean {
    return content.includes('DOMPurify') || content.includes('sanitize');
  }
}

2. Framework-Specific Detection

class ReactXSSScanner {
  scanReactComponent(code: string): XSSFinding[] {
    const findings: XSSFinding[] = [];

    // Check for unsafe React patterns
    const unsafePatterns = [
      'dangerouslySetInnerHTML',
      'createMarkup',
      'rawHtml'
    ];

    unsafePatterns.forEach(pattern => {
      if (code.includes(pattern) && !code.includes