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$100-$5000 worth File Upload Vulnerability | Advanced Techniques
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3 min read6 days ago
Hidden and Advanced Techniques to bypass File Upload Restrictions
Hi geeks, it4chis3c (Twitter) came-up with another bounty earning write-up in the Bug Bounty Hunting Series:
Uncover File Upload Vulnerabilities
File upload vulnerabilities are a critical entry point for attackers to execute code, deface websites, or pivot into internal networks. While basic checks (e.g., testing for .php uploads) are well-known, advanced techniques are required to bypass modern defenses. Let us dive into practical, real-tested methods including secret tricks and flag usage.
1. Bypass Validation Layers: Beyond the Obvious
Why: Modern apps use multiple validation layers (client-side, server-side, file type checks). To bypass them, you need to chain techniques.
