AI agents introduce security flaws in Next.js, Supabase, and Stripe applications

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A developer identified multiple security bugs that AI coding agents commonly write in applications built with Next.js, Supabase, and Stripe. These issues often pass basic functionality tests, leading to their deployment. The bugs include creating overly permissive database policies and using administrative keys that bypass security checks in user-facing code. The developer provides corrected code snippets and specific rules to prevent each vulnerability. These rules are intended for inclusion in project configuration files to guide AI tools.

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