🧬 Related Insights?

- **Read more:** [10 CodePen Demos That Expose CSS's Sneaky Brilliance in 2026](https://devtoolsfeed.com/article/10-codepen-demos-that-expose-csss-sneaky-brilliance-in-2026/) - **Read more:** [Cursor Crushed Copilot in My 3-Month Code War—But Here's the Catch](https://devtoolsfeed.com/article/cursor-crushed-copilot-in-my-3-month-code-warbut-heres-the-catch/) Frequently Asked Questions **What is Supabase RLS and why does it fail?** Row Level Security locks Postgres rows by policy. Fails when enabled sans policies — anon key reads all. **How do I check Supabase RLS vulnerabilities?** SQL queries for pg_tables/pg_policies. Curl anon endpoint. Look for (true) or missing policies. **Best Supabase RLS policies for user data?** auth.uid() = user_id on SELECT/UPDATE, TO authenticated. No client INSERT/DELETE.

🗄️ Databases & Backend

Supabase RLS: The Silent Killer in Your Backend — And the Quick Fix

You flip the RLS switch on Supabase, celebrate, and ship. Then a stranger emails all your users' data. Here's the fix that saves your app.

theAIcatchup Apr 07, 2026 4 min read

Supabase dashboard with RLS enabled on a vulnerable user_profiles table

⚡ Key Takeaways

Enable RLS but always add user-scoped policies — or your anon key leaks everything. 𝕏
AI tools like Cursor generate quick 'true' policies for demos; audit before prod. 𝕏
Curl your public endpoint now: data dump means fix policies with auth.uid() checks. 𝕏

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theAIcatchup

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#Postgres policies #Postgres security #Row Level Security #Supabase RLS #Supabase security #database leaks

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Originally reported by dev.to

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