Hackerone 300$ bounty crlf injection #bugbounty

💻 How I Earned $300 with a CRLF Injection in a Live HackerOne Program

My bug bounty routine always starts the same:
Discover domains → ports → sub-subdomains → filter → end up with 1000+ testable URLs.
But manually testing each one for CRLF? Impossible.

So I automated the entire detection using a Python tool I built — crlfi.
Install → Run → Get instant Telegram alerts when a vuln appears.
And that’s exactly what happened…

One endpoint responded weirdly.
The server wasn’t cleaning CRLF characters in the Location header.
Using a simple payload, I injected a fake header + cookie — proving real impact like:
✔ Session hijacking
✔ Header manipulation
✔ Security feature bypass

Submitted the report → Company confirmed → Rewarded $250 bounty + $50 bonus = $300 🔥

Every big win in bug bounty starts with small payloads and deep automation.
Want more real bug bounty case studies, payloads, and tools?

👉 Follow & comment “300”
https://karthithehacker.com/blog/crlfi-in-h1-300$-bounty.html

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