const isLocalhost = (url) => host === '127.0.0.1' ; if (isLocalhost(url)) return res.status(400).send('Localhost requests blocked');
The challenge is solved when the student successfully extracts encryptionkey.txt . The OWASP Juice Shop SSRF challenge provides a realistic, hands-on example of how an innocent-looking image fetch endpoint can become a gateway to internal resources. By exploiting it, attackers can read local files, scan internal networks, and steal cloud credentials. Mitigation requires strict allowlisting, network controls, and never trusting user-supplied URLs. owasp juice shop ssrf
GET /api/Image?url=http://localhost:3000/encryptionkey.txt If the challenge is active, the server will fetch that internal resource and return its content inside the image response (or as plain text if content type mismatches). const isLocalhost = (url) => host === '127