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.

Jared Hasson Jared Hasson Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever MFox MFox Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking. Caio Rodrigues Caio Rodrigues I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures. I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations. Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization. I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems. My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.** Meïr Ankri Meïr Ankri Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews. 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. Anthony Akpan Anthony Akpan Developer with 8 years of experience building softwares fro startups Simon A. Simon A. I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows. Krishna Sai Kuncha Krishna Sai Kuncha Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : ) David Olverson David Olverson Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production. Matt Butler Matt Butler Software Engineer @ AWS

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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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