The first breakthrough came from testing the boundaries of that URL input. By pointing the tool toward a local loopback address, the researcher confirmed a Server-Side Request Forgery (SSRF) vulnerability. The server wasn't just fetching public websites; it was willing to talk to itself. : Lack of input validation on the submitted URL.
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Inspect the PDF metadata. You can use tools like exiftool or online PDF viewers to identify the generator as . Step 2: Testing for SSRF The first breakthrough came from testing the boundaries