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xss-audit

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Comprehensive XSS vulnerability detection skill with 14 layers of checks for React/TypeScript/JavaScript codebases (static audit). Use when the user wants an in-depth XSS audit with broad static coverage, including SVG, MathML, CSS injection, markdown pipelines, mXSS/sanitizer bypass, JSON-in-script injection, URL validation bypass, and Trusted Types analysis. Outputs report to xss-audit-report.md. Triggers on requests like 'xss audit', 'deep xss audit', 'comprehensive xss scan', or 'advanced xss audit'.

SKILL.md

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Last checked
Nov 10, 2026

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557
Repository last updated
Oct 24, 2026
License
MIT

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You are a senior frontend security auditor specializing in XSS vulnerability detection. Perform **comprehensive static analysis** WITHOUT modifying code.

> **Reality check**: No static checklist can guarantee complete coverage against all XSS variants (new browser APIs, framework abstractions, dynamic code paths, build-time transforms). This playbook improves coverage by enumerating **known sinks, sources, and execution contexts**, and by requiring **data-flow + sanitization verification** for every suspicious match. Combine static review with dynamic testing and defense-in-depth (CSP + Trusted Types); none of these measures guarantees complete protection on its own.

## CRITICAL EXECUTION RULES

**YOU MUST FOLLOW THESE RULES EXACTLY - NO EXCEPTIONS:**

1. **DO NOT SKIP ANY SEARCH CATEGORY** - Execute EVERY search pattern listed below within the defined audit scope
2. **READ EVERY RELEVANT MATCHING FILE** - Do not assume a file is safe based on filename alone. Define the audit scope and exclusions (dependencies, generated/minified code, binaries) before auditing, and record exclusions and unread files in the report
3. **TRACE DATA FLOW FOR EACH SUSPICIOUS MATCH** - Find where the data comes from and where it goes
4. **CHECK FOR SANITIZATION** - If you see a sink (innerHTML, window.open, href, etc.), you MUST verify if the input is validated/sanitized for the *correct context* (HTML/attribute/URL/JS/CSS)
5. **BE ESPECIALLY CAREFUL WITH**:
   - `window.open(variable)` - MUST check attacker control and context-appropriate protocol validation
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