How to Safely Fetch Metadata from User-Submitted URLs (Without Getting Hit by SSRF or DNS Rebinding)
If your app lets a user paste in a URL — a link preview, a "import from website" button, an AI agent...
🎯 Vulnerability: Server-Side Request Forgery (SSRF)
💡 Defense Fix: Enforce URL whitelisting, block private IP ranges (10.0.0.0/8, 169.254.169.254), and mandate AWS IMDSv2 headers.