CVE-2026-44578 PoC Understanding WebSocket SSRF Understand how CVE-2026-44578 affects WebSocket upgrade request handling in self-hosted Next.js deployments. Explore the SSRF vulnerability, proof of concept research, attack paths, and possible exposure of internal endpoints. This technical overview explains the security issue, affected Next.js releases, and defensive measures developers can use to validate request routing, restrict outbound connections, and protect sensitive infrastructure. https://www.appsecmaster.net/blog/cve-2026-44578-nextjs-websocket-ssrf-vulnerability/