THE BRUTE ART OF BYPASS

Unfiltered Edition - XSS Filter Evasion Techniques

The systematic guide to bypassing XSS filters and WAFs. Learn the methodology that maps filter behavior, exploits human assumptions, and finds bypasses others miss.

WAFs get updated. Public bypasses get patched. That payload that worked last month? Blocked today. You need the methodology to think faster than filter builders patch. Learn to find yours before the crowd does.

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The Brute Art of Bypass Book Cover

Outsmart The Filter Builders

Filters fail because humans built them with limited time, knowledge, and willingness to break customer applications. Every filter update reveals its creators' assumptions. Every patch shows what they missed before.

This guide gives you the framework to stay ahead—not just current bypasses that'll be patched next month, but the systematic methodology to find new ones yourself. Real hackers bypass security on the fly. Regular guys copy and paste payloads like copycats.

The game isn't about breaking technology—it's about outsmarting the people who built the filters. CloudFlare, Akamai, Imperva, and Fortinet all share the same weakness: human limits in their creators.

20+
Pages
10
Easy Wins
30+
Techniques

What You'll Learn

🎯

Trial & Error Methodology

Systematic probing techniques. Backwards mapping to break down blocked payloads. Onwards mapping to build undetected vectors.

🔓

Universal Bypass Techniques

Exploit post-filter modifications. When apps change input after filtering, security layers become irrelevant.

🔤

Encoding Mastery

Mix JavaScript encodings with HTML entities. Eight ways to encode a single character. Break charset-based filters.

✂️

Keyword Splitting

Fragment keywords and rebuild at runtime. Use template literals and property indexing to blind static filters.

🏷️

Tag Blending

Move payloads into DOM text. Use innerHTML and URL fragments to assemble code client-side, invisible to filters.

💬

Comment & Jump

Break filter context with comment-newline combos. Works across JavaScript, SQL, and command injection.

10 Proven "Easy Win" Bypasses

These aren't theoretical. Each technique includes the filter it defeated and why it worked. You get the bypass, the explanation, and the underlying principle so you can adapt it when filters evolve.

EASY WIN #1

Exploit Regex's Early Exit

EASY WIN #2

Evade with Invisible Characters

EASY WIN #3

Subvert the Expected Order

EASY WIN #4

Validation Is a Lie

EASY WIN #5

Exploit Obscure Event Handlers

EASY WIN #6

Weaponize Misconfigured Whitelists

EASY WIN #7

Exploit Partial Matches

EASY WIN #8

Win the Race Condition

EASY WIN #9

Make Them Fix Your Payload

EASY WIN #10

When Filters Get Played

Complete Contents

PART 1

Core Concepts & Methodology

KISS principle, filter analysis, trial and error methodology, feeding and breaking filter assumptions, and the foundational "It's All About Assumptions" mindset.

PART 2

Baseline Attacks & Techniques

Testing vectors, encoding variations, regex flaws, universal bypass exploitation, method swapping, keyword splitting, and syntax exploitation.

PART 3

Advanced Exploitation

Character mutation, HTTP Parameter Pollution, Base64 exploitation, tag blending, comment techniques, HTML vector bypasses, and the JavaScript playground.

About the Author

Rodolfo Assis

Rodolfo Assis (Brute Logic)

XSS Expert KNOXSS Creator 15+ Years Experience 1000+ Vulnerabilities Top 200 Global Influencer DEFCON Speaker

Independent cybersecurity researcher with 15+ years of experience in web application security. Creator of KNOXSS, the industry-leading automated XSS detection tool used by hundreds of security professionals worldwide.

Has helped fix over 1,000 XSS vulnerabilities including discoveries in major companies like Oracle, Samsung, Uber, Apple, Amazon, and Microsoft. Recognized as a Top 200 Global Cybersecurity Influencer by CheckPoint/Perimeter 81.

International speaker at conferences including DEFCON and Ekoparty. Author of the Brute XSS Cheat Sheet series. Philosophy: XSS is much more than <script>alert(1)</script>

Frequently Asked Questions

How is this different from PortSwigger's or even Brute Logic's XSS cheat sheet?
PortSwigger gives you payloads to test. Brute Logic's cheat sheet is a top list of payloads including several for bypass, but it doesn't explain the techniques behind them. This book is the methodology—the thinking process that lets you find bypasses when known payloads fail and filters evolve.
Why not just use an automated tool like KNOXSS?
Tools hit known patterns. When you're facing a custom filter or a WAF that's been updated since the last scan, you need to think manually. This book teaches you to probe systematically when automation fails.
Is this just theory or actual working techniques?
Working techniques. The 10 Easy Wins are documented bypasses that worked against real filters. The methodology is what you use when those specific bypasses get patched.
Will this help me on bug bounty programs?
If you're already finding XSS but getting blocked by WAFs, yes. This helps you push through that last layer. If you're not finding XSS at all, start with fundamentals first—this assumes you already know where to inject.

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What You Get:

  • Complete XSS filter bypass guide (PDF format)
  • 3 parts: concepts, baseline attacks, advanced exploitation
  • 10 "Easy Win" techniques with real-world examples
  • Systematic trial and error methodology
  • Fast Delivery (Within 2 Hours)
  • Free lifetime updates to all revisions (same edition)
$39 $49 Launch Price: Save $10!
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Having trouble with payment? Contact: assis@brutelogic.net