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Next.js 15 App Router and Supabase auth changes require new security architecture

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Next.js 15's migration to React 19 server components introduces authentication challenges for developers using Supabase. Legacy authentication helpers are now deprecated, requiring updated implementation patterns. Incorrect server-side authentication can cause silent failures like session leaks and infinite redirect loops. A common security vulnerability involves using the insecure getSession() method instead of getUser() for server access control. The article proposes a three-layer architecture to ensure secure session handling and Row Level Security enforcement.

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Next.js 15 App Router and Supabase auth changes require new security architecture · ShortSingh