User-Agent XSS Explained | Live Demo & Bug Bounty Tutorial 2025
(This video is strictly educational and defense-focused. All demonstrations were performed in a safe test environment. Do NOT attempt unauthorized testing on live sites — always get permission or use a bug-bounty program.)

In this video I explain User-Agent XSS in clear, practical terms and show how developers and bug-bounty hunters can detect, report, and — most importantly — fix it. First, I cover the core concept: what User-Agent XSS is, how the User-Agent HTTP header can become an injection vector, and the common contexts where DOM-based or reflected XSS can occur. I focus on high-level mechanics rather than exploit code so you understand the vulnerability model and why it matters for cookie safety, session integrity, and overall application security.
#UserAgentXSS #BugBounty #WebSecurity