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This wasn’t one of those days where I woke up hunting a critical bug. It was a slow recon day. The kind where you’re half-curious, half-tired, and just letting tools run while your brain switches to autopilot.
I was scrolling through JavaScript files without expecting much. No pressure. No rush. Just reading.
And then one file started talking a little too much.
This write-up is about how that single frontend file quietly led me to backend access, internal APIs, and a cache poisoning issue that turned into a proper, high-impact bug.
No magic. No guessing. Just patience and following what the application itself was already telling me.
Step 1: Collect First, Think Later
I didn’t start by attacking anything. I just gathered data.
cat alive.txt | gau | grep '\.js$' > js_files.txt