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.
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 : )
Alvin Voo
I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing.
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Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
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
legrab
I'll fill this later
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
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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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.
ISHANTDEEP SINGH
Senior Software Engineer with 7+ years of experience in React, JavaScript, TypeScript, Next.js, and Node.js. I’ve also worked as a tech lead for startups, owning end-to-end technical execution including architecture, development, scaling, and delivery. I bring a strong mix of hands-on coding, product thinking, and technical leadership, and I’m comfortable building products from scratch as well as improving and scaling existing systems.
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.