v0.dev Security Issues
The most common security vulnerabilities in v0.dev applications—and how to fix them before attackers find them.
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6 Security Issues Documented
Common vulnerabilities found in v0.dev applications
Critical Security Issues
XSS via dangerouslySetInnerHTML
criticalAI may suggest React patterns that render unsanitized HTML.
Cross-site scripting, session theft, malicious redirects.
Search generated code for dangerouslySetInnerHTML.
Sanitize all dynamic HTML with DOMPurify before rendering.
High Severity Issues
Missing Server-Side Validation
highv0 generates UI but not backend validation logic.
Input validation bypass, injection attacks.
Check if form handling has server-side validation.
Add server-side validation for all user inputs. Use zod or similar.
Placeholder API Calls
highGenerated code may include fake or example API endpoints.
Application errors, potential security misconfigurations.
Search for fetch calls with placeholder URLs.
Replace all placeholder URLs with real, secure endpoints.
Client-Only Auth
highUI-only authentication that can be bypassed.
Unauthorized access by bypassing client-side checks.
Check if auth is verified server-side on protected routes.
Implement proper auth with NextAuth.js, Clerk, or Supabase Auth.
Medium Severity Issues
Outdated Dependencies
mediumSuggested packages may have known vulnerabilities.
Known CVEs in project dependencies.
Run npm audit or yarn audit.
Update vulnerable packages. Check before installing suggestions.
Missing CSRF Protection
mediumForms without CSRF tokens on state-changing operations.
Cross-site request forgery attacks.
Check if forms include CSRF protection.
Use framework CSRF protection or implement token validation.
How to Prevent These Issues
- Run automated security scans before every deployment
- Configure database access controls (RLS/Security Rules) first
- Store all secrets in environment variables, never in code
- Enable email verification and strong password policies
- Add security headers to your hosting configuration
- Review AI-generated code for security before accepting
Find Issues Before Attackers Do
VAS scans your v0.dev app for all these issues automatically. Scans from $5, instant results.
Get Starter ScanFrequently Asked Questions
What are the most common v0.dev security issues?
The most common issues are: exposed API keys/secrets, missing database access controls (RLS or Security Rules), weak authentication configuration, and missing security headers. These account for over 80% of vulnerabilities in v0.dev applications.
How do I find security issues in my v0.dev app?
Run a VAS security scan for automated detection of common vulnerabilities. Manually check: database access controls, search code for hardcoded secrets, verify authentication settings, and test security headers. VAS catches all of these automatically.
Are v0.dev security issues fixable?
Yes, nearly all v0.dev security issues are configuration problems with straightforward fixes. Missing RLS, exposed secrets, weak auth—all have clear remediation steps. Most fixes take under an hour to implement.
How quickly can v0.dev security issues be exploited?
Exposed databases and API keys can be discovered within minutes using automated scanners. Attackers actively scan for common patterns. This is why security configuration must happen before deployment, not after.
Does v0.dev have built-in security?
v0.dev provides security features, but they require configuration. Security isn't automatic—you must enable database access controls, manage secrets properly, configure auth settings, and add security headers. The tools exist; you must use them.
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Last updated: January 16, 2026