🚨 File Upload Bypass leads to stored XSS Earned Me $$$ | hackwithrohit | bug bounty POC
🔐 Breaking File Upload Security: A Real Bug Bounty Discovery $$$
I recently discovered a critical file upload vulnerability in a production web application during a bug bounty program. The vulnerability allowed bypassing file extension restrictions through Content-Type header manipulation.
🔍 Vulnerability Overview:
Location: Profile picture upload endpoint
Impact: Potential XSS → Account takeover
Root Cause: Extension validation without Content-Type verification
Bypass: HTML files uploaded as "image/jpeg"
💡 Key Learning Points:
Never trust client-side validation - Server-side checks are non-negotiable
Defense in depth - Multiple validation layers prevent single-point failures
Real impact - What starts as "simple XSS" can escalate to critical issues
🎬 Full Analysis:
I've created a complete lab environment to demonstrate this vulnerability, complete with exploitation steps and mitigation strategies. Perfect for:
Security engineers validating their upload implementations
Bug bounty hunters looking for new techniques
Developers understanding security implications
⚠️ DISCLAIMER: Educational content only. All demonstrations in controlled lab. Never test without permission. Be ethical!
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