---
title: "Ethical Hacker (@usman4) | Hashnode"
description: "Passionate about identifying security vulnerabilities and helping organizations strengthen their posture. Specialized in traditional web application testing,..."
url: "https://hashnode.com/@usman4"
---

@usman4

# Ethical Hacker

@usman4 · Joined November 2026

### [Day 1 of my learning:](https://0xsec.hashnode.dev/day-1-my-learning-broken-access-control-linux-file-system?utm_source=hashnode&utm_medium=feed)

My Day 1 learning covering BAC (Vertical/Horizontal), IDOR, session state, modern Linux File Systems (Inodes, Links, VFS) from standard sources.

3 min read · [0xsec.hashnode.dev](https://0xsec.hashnode.dev/day-1-my-learning-broken-access-control-linux-file-system?utm_source=hashnode&utm_medium=feed)

[3h ago](https://hashnode.com/posts/day-1-my-learning-broken-access-control-linux-file-system/6af4b3bd8c56dfc3ddd2162f)