Common Issues auth

Users Can See or Do Things They Shouldn't

Your app doesn't properly control who can see or do what. Regular users might access admin pages, see other users' private data, or perform actions (like deleting or editing) that should be restricted.

Common Causes

  • No role-based access control (RBAC) implemented
  • Access checks only on the frontend — the API allows anything
  • Row Level Security not configured (anyone can query any data)
  • Admin routes are accessible by anyone who knows the URL
  • User ID not validated on API calls — users can modify other users' data by changing the ID

How to Fix It

  1. Test by logging in as a regular user and navigating directly to admin URLs
  2. Check if API endpoints verify the user's role before performing actions
  3. If using Supabase, implement RLS policies that restrict data access by user ID
  4. Add server-side authorization checks — never rely only on hiding UI elements
  5. Verify that users can only read/update/delete their own data

Real developers can help you.

Matt Butler Matt Butler Software Engineer @ AWS prajwalfullstack prajwalfullstack Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help Rudra Bhikadiya Rudra Bhikadiya I build and fix web apps across Next.js, Node.js, and DBs. Comfortable jumping into messy code, broken APIs, and mysterious bugs. If your project works in theory but not in reality, I help close that gap. BurnHavoc BurnHavoc Been around fixing other peoples code for 20 years. zipking zipking I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify. As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value. Tejas Chokhawala Tejas Chokhawala Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript. Focused on performance, clean architecture and shipping fast. Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools. Jen Jacobsen Jen Jacobsen I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses. I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain. rayush33 rayush33 JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems Omar Faruk Omar Faruk As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience. My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture. I played a key role in creating a scalable and maintainable platform to support educators and learners globally. I'm enthusiastic about embracing new challenges and making meaningful contributions. Costea Adrian Costea Adrian Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.

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Frequently Asked Questions

Users can access the admin page. Is this a big deal?

Yes. If the admin page has real functionality (delete users, change settings), this is a serious security issue. Get it fixed immediately.

How do I know if my app has permission issues?

Try logging in as a regular user and manually navigating to admin URLs. Also check if you can modify another user's data by changing IDs in API requests.

Related Common Issues Issues

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