Next.js 16 Server Actions Security: The Auth Check Most Developers Miss
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Practical security guide for Next.js Server Actions, highly actionable for a senior engineer working with modern frameworks.
Summary
Next.js 16 Server Actions are public HTTP endpoints, not internal helpers—'use server' exposes them without authentication or authorization. Developers often protect the page UI but skip auth checks inside the action, leaving mutations vulnerable to direct cURL calls with any valid session. The fix requires explicit session verification and resource ownership checks inside every Server Action, treating it as an independent API endpoint.