Head(er) Games: How I Turned CORS Misconfig into a Full Data Dump

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Hey there!😁

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You ever spend hours writing an email and forget to hit send? That was me, except instead of an email, it was my browser screaming, “Why are you trusting me with everything?!” 🫣

It all started during one of those 2 AM recon sessions where I questioned life, caffeine, and why CORS headers still suck in 2025.

This is the story of how a missing wildcard, a single header, and a dash of JavaScript gave me the keys to the kingdom — aka a full production data dump.

I was running my usual subdomain recon using this combo:

subfinder -d target.com | httpx -title -status-code -web-server -tech-detect

And there it was:

api.secure-preview.target.com