Toxssin is an open-source penetration testing tool that automates the process of exploiting Cross-Site Scripting (XSS) vulnerabilities. It consists of an https server that works as an interpreter for the traffic generated by the malicious JavaScript payload that powers this tool (toxin.js). This project started as (and still is) a research-based creative endeavor to explore the exploitability depth that an XSS vulnerability may introduce by using vanilla JavaScript, trusted certificates and cheap tricks. Disclaimer: The project is quite fresh and has not been widely tested.