P4 Bugs and POC | Part 1

👋 Hi everyone!
I’m Abhijeet Kumawat, a passionate bug bounty hunter and security researcher. I thrive on exploring vulnerabilities and sharing my insights with the community. Today, I’m thrilled to kick off a new blog series focused on P4 bugs — those often-overlooked low-severity vulnerabilities that can still pack a punch when properly exploited.

In this series, I’ll break down various P4 vulnerabilities, explaining how they work and providing detailed proof-of-concept (PoC) demonstrations to help you sharpen your skills. By following along and applying these techniques, you’re bound to uncover valid P4 bugs on real-world targets. 🕵️‍♂️

For the first part, let’s dive into Broken Link Hijacking (BLH) — a simple yet impactful vulnerability that’s often hiding in plain sight.

In simple terms, Broken Link Hijacking occurs when an organization’s website points to an external resource (like a social media account, JavaScript file, or image) that no longer exists. If this external resource is up for grabs — such as an expired domain or an available social media handle — an attacker can claim it and exploit the broken link.