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From discovering duplicate parameters to bypassing authentication, accessing internal APIs, and uncovering hidden data. Join my journey of HTTP Parameter Pollution exploitation with full technical PoC. ☕
You know that feeling when you show up to a party uninvited and accidentally become the life of it? 🎊 That was me — but instead of a party, it was a multi-million dollar company’s API endpoint, and instead of funny stories, I brought duplicate URL parameters that crashed their system and spilled all their secrets. My cat watched in judgment as I celebrated finding a bug more predictable than my morning coffee routine.
It all started on a boring Wednesday. Coffee in hand ☕, I was testing a fancy SaaS application — let’s call them cloudapi.com. I'd found an interesting endpoint during recon:
GET /api/v1/user/profile?userId=12345