There is a specific silence that falls over a security team the moment they realize the breach wasn’t sophisticated. No zero-day. No nation-state tooling. No polymorphic malware that burned through your EDR like tissue paper. Just someone — maybe a curious teenager with a browser and a free afternoon — who changed a number in a URL.
I’ve watched that silence happen in person. Late 2023, a mid-size fintech in Lagos whose name you’d recognize if I printed it. Their API had been live for eleven months. Their security budget wasn’t small. Their CTO had a CompTIA Security+ cert framed above his monitor. And yet their entire customer transaction history — account numbers, transfer amounts, recipient details — was sitting there, accessible to anyone who’d bothered to increment an integer past their own user ID.