Lovable
security
Insecure File Upload in Lovable App
Your Lovable app's file upload feature accepts any file type without validation, potentially allowing users to upload malicious scripts, executable files, or oversized files that could compromise your server or other users.
Without proper file validation, an attacker could upload a PHP script, an HTML file containing JavaScript, or a file disguised as an image that actually contains malware. If these files are served back to users, the malicious code could execute.
This is especially dangerous if uploaded files are stored in a publicly accessible location and served directly to users without content-type validation.
Error Messages You Might See
File type not allowed
413 Payload Too Large
Storage quota exceeded
Failed to upload file: permission denied
Common Causes
- No file type validation — The upload endpoint accepts any file regardless of extension or MIME type
- Client-side only validation — File type checks only happen in the browser, which can be easily bypassed
- No file size limits — Users can upload extremely large files, causing storage and bandwidth issues
- Files served with wrong content-type — Uploaded files are served back without proper Content-Type headers, allowing browser execution
- No malware scanning — Uploaded files are stored and served without any security scanning
How to Fix It
- Validate file types on the server — Check both file extension and MIME type on the backend, not just in the browser
- Set file size limits — Configure maximum upload sizes (e.g., 5MB for images, 25MB for documents)
- Rename uploaded files — Generate random filenames to prevent path traversal attacks
- Serve files with correct headers — Set Content-Type and Content-Disposition headers to prevent browser execution
- Use Supabase Storage policies — Configure bucket policies to restrict file types and sizes at the storage level
Real developers can help you.
Franck Plazanet
I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth.
Core Expertise:
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🏗️ Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure.
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I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity.
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
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.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
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.
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.
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.**
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
Nam Tran
10 years as fullstack developer
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.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
What file types should I allow?
Only allow the specific types your app needs. For profile pictures, allow only .jpg, .png, .webp. For documents, allow .pdf, .doc, .docx. Never allow .html, .js, .php, .exe, or .svg files from untrusted users.
Is Supabase Storage secure by default?
Supabase Storage requires you to set up bucket policies. By default, buckets are private, but you need to configure what file types and sizes are allowed, and who can upload.