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Dev.to
7/22/2026
Server Actions blur the client-server line and juniors are paying for it

Server Actions blur the client-server line and juniors are paying for it

Short summary

Next.js Server Actions inadvertently expose unauthenticated RPC endpoints that frontend developers don't realize they're creating, leading to serious security vulnerabilities including multiple CVEs with CVSS 10.0. The abstraction blurs the frontend/backend boundary, forcing UI-focused devs to handle backend threat modeling they were never trained on. Teams should treat every Server Action as a public endpoint with auth checks and payload validation from the start.

  • •Server Actions create public POST endpoints that bypass normal app security checks
  • •Multiple CVEs (CVSS 10.0) exploited permissive serialization in React Server Functions
  • •Treat every Server Action as a public API: validate payloads, check auth, expect direct POSTs

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