Server-Side Request Forgery (SSRF) allows attackers to exploit servers that make requests to user-controlled destinations, potentially accessing internal services that lack authentication. Webhook systems are particularly vulnerable, as attackers can redirect requests to internal endpoints. Protection strategies include validating and sanitizing URLs, blocking private IP ranges using libraries like SafeURL, performing DNS lookups at both configuration and request time to prevent DNS rebinding attacks, and using dedicated proxy services. Network segmentation, firewall rules, and proper authentication for internal services provide additional defense layers.