Hey Hunter's,
DarkShadow here back again!

Check your burp isn't this feature is enable?

Most of hackers miss this thing. So, this is a great opportunity to make bounty using this burp feature.

#bugbountytips #burp

🪲 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

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✅ https://github.com/1N3/Sn1per

Hey Hunter's,
DarkShadow here back again!

A hidden backdoor was in PHP version which allow remote code execution In user-agent header.

Guess Guy's which version it is?

#backdoor