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Web Fuzzing for Hackers
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Web Fuzzing for Hackers

A practical guide to web fuzzing for bug bounty hunters, covering wordlist selection (custom vs. SecLists-style generic lists), and tool-specific configuration for content discovery, subdomain/VHost enumeration, and parameter/header discovery using ffuf, Burp Suite Intruder, OWASP Amass, dnsx, Arjun, and Param Miner. It details concrete techniques such as subdomain permutation patterns, extension fuzzing for leftover files (.md, .env, .sql), dotfile/prefix patterns (/.FUZZ, /-FUZZ, /~FUZZ), IIS-specific extensions (.asmx, .ashx, .aspx.bak), and hidden-header fuzzing (X-Forwarded-For, X-Debug, X-HTTP-Method-Override) that can lead to SQLi, cache poisoning, or access-control bypass.

TL;DR Deep-dive bug bounty guide to fuzzing wordlists and tooling (ffuf, Amass, Arjun, Param Miner) for content, subdomain, parameter and header discovery.
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Organisations named here

  • Assetnote

Technologies named here

  • React
  • Ffuf
  • Burp Suite Intruder
  • Angular
  • Vue
  • OWASP Amass
  • IIS / ASP.NET
  • dnsx
  • Arjun
  • Burp Suite Param Miner
  • SecLists
  • Assetnote wordlists
  • Burp Suite
  • IIS

Techniques named here

  • Web fuzzing
  • Custom wordlist building
  • Subdomain bruteforcing/enumeration
  • Wildcard DNS filtering
  • Subdomain permutation fuzzing
  • Virtual host enumeration
  • Content discovery fuzzing
  • Extension fuzzing
  • Hidden directory/file prefix pattern fuzzing
  • Technology-specific fuzzing
  • Parameter fuzzing / hidden parameter discovery
  • Content-Type variation fuzzing
  • Request header fuzzing
  • Thread/rate tuning for fuzzing

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