Lovable
security
XSS Vulnerability in Lovable App User Input
Your Lovable app displays user-submitted content (comments, profile names, form inputs) without properly sanitizing it. This allows attackers to inject malicious JavaScript that runs in other users' browsers.
Cross-site scripting (XSS) is a serious vulnerability that can steal user sessions, redirect users to phishing sites, or modify what your app displays. If your app has any feature where one user's input is shown to another user, it may be vulnerable.
The issue often goes unnoticed until someone submits a script tag in a form field and it executes, or until your app is flagged in a security scan.
Error Messages You Might See
Content Security Policy violation
Refused to execute inline script
Unsafe HTML content detected
Common Causes
- Using dangerouslySetInnerHTML — Lovable may generate React code that renders user content as raw HTML
- No input sanitization — User input is stored and displayed exactly as entered, including HTML and script tags
- Template literals in DOM — User data inserted into the page using template strings without escaping
- Missing Content-Security-Policy headers — No CSP headers to prevent inline script execution
How to Fix It
- Never use dangerouslySetInnerHTML with user data — Replace it with regular text rendering that auto-escapes HTML
- Install DOMPurify — If you must render HTML, use a sanitization library like DOMPurify to strip malicious content
- Add Content-Security-Policy headers — Configure CSP headers to prevent inline script execution
- Validate and sanitize on the server — Clean user input before storing it in the database, not just when displaying it
- Test with common XSS payloads — Try submitting <script>alert('xss')</script> in your form fields to verify they're safe
Real developers can help you.
legrab
I'll fill this later
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
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.
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.**
Antriksh Narang
5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
BurnHavoc
Been around fixing other peoples code for 20 years.
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.
prajwalfullstack
Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
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 is XSS and why is it dangerous?
Cross-site scripting (XSS) allows attackers to inject malicious scripts into your app. When other users visit the page, the script runs in their browser and can steal their login sessions, personal data, or redirect them to fake sites.
Can React prevent XSS automatically?
React escapes content by default when you use JSX expressions like {userInput}. However, using dangerouslySetInnerHTML or inserting content via DOM manipulation bypasses this protection.