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Developers have learned that sequential IDs ( /user/123 ) are bad. So they use UUIDs: /api/invoice/550e8400-e29b-41d4-a716-446655440000 . The myth is that UUIDs are unguessable. They are not if they are exposed elsewhere. Check JavaScript source maps, WebSocket messages, or browser local storage for a different user’s UUID. Then, modify the endpoint. Also, try v2 of the API: /api/v2/invoice/550e8400... . Versioning often breaks access controls.

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Tools assist your workflow, but your mindset finds the bugs. InfoSec Write-ups Developers have learned that sequential IDs ( /user/123

SSRF allows you to make the server "talk" to its internal network. Image uploaders, URL parsers, or PDF generators. modify the endpoint. Also