Individual skill
exploiting-prototype-pollution-in-javascript
Detects and exploits JavaScript prototype pollution vulnerabilities in client-side and server-side (Node.js) applications to achieve XSS, RCE, or authentication bypass through property injection into Object.prototype. Use when assessing a JavaScript/Node.js application for prototype pollution, especially where a merge, clone, or extend function accepts user-controlled keys.
skills/exploiting-prototype-pollution-in-javascript/SKILL.md
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- Last checked
- Nov 9, 2026
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- 35,816
- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- prototype-pollution Declared skill tag
- javascript Declared skill tag
- node-js Declared skill tag
- xss Declared skill tag
- rce Declared skill tag
- property-injection Declared skill tag
- dom-xss Declared skill tag
- server-side-pollution Declared skill tag
- security Derived category
- security-application Derived category
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Read excerpt
# Exploiting Prototype Pollution in JavaScript
## When to Use
- When testing Node.js or JavaScript-heavy web applications
- During assessment of APIs accepting deep-merged JSON objects
- When testing client-side JavaScript frameworks for DOM XSS via prototype pollution
- During code review of object merge/clone/extend operations
- When evaluating npm packages for prototype pollution gadgets
## Prerequisites
- Burp Suite with DOM Invader extension for client-side prototype pollution detection
- Node.js development environment for server-side testing
- Understanding of JavaScript prototype chain and object inheritance
- Knowledge of common pollution gadgets (sources, sinks, and exploitable properties)