If you’ve ever seen a payload like this and ignored it:-

{"__proto__":{"isAdmin":true}}

You probably missed a real P1.

Prototype Pollution isn’t about breaking authentication directly.
It’s about poisoning the logic the application trusts.

And when modern JavaScript apps trust polluted objects — things fall apart fast.

🧠 What Is Prototype Pollution (No Theory, Just Reality)

Prototype Pollution happens when:

• A JavaScript application merges user-controlled objects
• Without filtering dangerous keys
• Allowing attackers to modify the prototype of objects

In simple terms:

You don’t change your object
You change the default behavior of all objects

🎯 Why This Bug Is High Impact