Next.js 16 Auth Security: 5 Mistakes Exposing Your App in 2026

Next.js 16 auth changed silently: proxy.ts replaces middleware.ts, Server Actions are open endpoints, and 13 CVEs hit in May 2026. Here is what to fix right now.

Next.js 16 auth changed silently: proxy.ts replaces middleware.ts, Server Actions are open endpoints, and 13 CVEs hit in May 2026. Here is what to fix right now.