v0.dev Security Scanner
Using v0.dev to generate UI components? Make sure the code it generates is secure. We check for common vulnerabilities in AI-generated React code.
Our automated security scanner analyzes your v0 application for vulnerabilities, misconfigurations, and exposed secrets. Get a comprehensive security report in minutes, not days.
v0.dev Security Considerations
v0.dev makes development fast, but AI-generated code often skips security best practices:
- !Generated components may include insecure patterns
- !XSS vulnerabilities in dynamic content handling
- !Missing input validation and sanitization
- !Insecure data fetching patterns
Where Security Breaks in v0.dev Apps
Built on Supabase (Postgres + RLS), v0.dev applications share a recognizable fingerprint — which means attackers and automated scanners find them the same way every time. Based on real vulnerability patterns in v0.dev deployments, the breakdown is 0 critical-impact issues, 3 high-impact, and 2 medium-or-lower.
XSS via dangerouslySetInnerHTML
AI may suggest React patterns that render unsanitized user content.
Fix: Search for dangerouslySetInnerHTML. Sanitize all dynamic HTML with DOMPurify.
Missing Input Validation
v0 generates UI but not server-side validation logic.
Fix: Add server-side validation for all form inputs. Never trust client-side only.
Placeholder API Calls
Generated code may include placeholder URLs or fake endpoints.
Fix: Review all fetch/API calls. Replace placeholders before deployment.
Client-Side Auth Patterns
UI-only auth flows that can be bypassed.
Fix: Implement real auth with NextAuth.js, Clerk, or Supabase Auth.
Outdated Dependencies
Suggested packages may have known vulnerabilities.
Fix: Run npm audit after installation. Update vulnerable packages.
What We Check
XSS Prevention
Checks generated components for proper escaping and sanitization of user input and dynamic content.
Secret Detection
Scans for any API keys or secrets that may have been included in generated code examples.
Security Headers
Verifies your deployed app has proper security headers configured.
Auth Patterns
Reviews authentication and authorization patterns in generated code for common security issues.
What You'll Get
Why v0.dev Apps Need Security Scanning
v0.dev by Vercel generates beautiful React components from natural language descriptions. While the generated code is functional and well-structured, AI-generated code can sometimes include patterns that introduce security vulnerabilities, especially when handling user input or fetching data.
When you integrate v0 components into a full application, security becomes your responsibility. The generated components need proper input validation, output encoding, and secure data handling practices. Without these safeguards, your application could be vulnerable to cross-site scripting (XSS), injection attacks, and data exposure.
VAS analyzes your deployed application to identify security issues in both v0-generated components and your custom code. We check for XSS vulnerabilities, insecure data handling, missing security headers, and exposed secrets.
How v0.dev Security Scanning Works
Submit Your URL
Enter your v0 application URL. Our scanner automatically detects your tech stack and configures the appropriate security checks for v0.dev.
Automated Analysis
We scan for exposed secrets, security headers, authentication issues, database misconfigurations, and v0.dev-specific vulnerabilities. The scan typically completes in 15-20 minutes.
Get Actionable Results
Receive a detailed report with prioritized vulnerabilities, severity ratings, and step-by-step remediation guidance with code examples specific to v0.dev.
Common Questions About v0.dev Security
What vulnerabilities are most common in v0.dev apps?
The top finding classes in v0.dev apps: xss via dangerouslysetinnerhtml; missing input validation; placeholder api calls.
What does a VAS scan of a v0.dev app check?
The scan probes your deployed app for the specific findings above: xss prevention, secret detection, security headers, auth patterns. It actually attempts each vulnerability class (not just header inspection) and reports results with severity + fix for each.
Is running a scan safe for production?
Yes. The scanner uses read-only probes against public endpoints — no data modification, no destructive tests. Scans typically finish in 15–20 minutes and will not impact application availability.
Remediation Playbook for v0.dev
Priority-ordered fixes for the specific findings we see in v0.dev apps. Critical items close data-exposure gaps; high items prevent compromise; medium items reduce attack surface. Applies to apps using Supabase (Postgres + RLS) — the dominant v0.dev stack.
1. XSS via dangerouslySetInnerHTML
Why it matters: AI may suggest React patterns that render unsanitized user content.
How to close it: Search for dangerouslySetInnerHTML. Sanitize all dynamic HTML with DOMPurify.
2. Missing Input Validation
Why it matters: v0 generates UI but not server-side validation logic.
How to close it: Add server-side validation for all form inputs. Never trust client-side only.
3. Placeholder API Calls
Why it matters: Generated code may include placeholder URLs or fake endpoints.
How to close it: Review all fetch/API calls. Replace placeholders before deployment.
4. Client-Side Auth Patterns
Why it matters: UI-only auth flows that can be bypassed.
How to close it: Implement real auth with NextAuth.js, Clerk, or Supabase Auth.
5. Outdated Dependencies
Why it matters: Suggested packages may have known vulnerabilities.
How to close it: Run npm audit after installation. Update vulnerable packages.
Verify the fixes stuck
Run a VAS scan after applying each fix to confirm the gap is actually closed. "I applied the fix" is not evidence — the fix may have been partial, reverted, or not deployed. Re-scanning gives you proof, and a record for compliance if you ever need it.
Secure Your v0.dev App
Don't let vulnerabilities compromise your hard work. Security issues in v0.dev applications can lead to data breaches, unauthorized access, and damaged user trust. The average data breach costs startups between $120,000 and $1.24 million.
Run a Starter Scan in minutes — just $9. Scan before you launch and deploy with confidence knowing your application meets security best practices.
Get Starter ScanMore on v0.dev Security
Every angle of v0 security — from the specific findings we detect to step-by-step fixes.
v0.dev Security Risks
Specific risks we find in v0 apps, with real-world examples.
v0.dev Security Issues
Issues grouped by severity with detection and fix steps.
v0.dev Best Practices
Remediation playbook derived from v0's actual failure modes.
Is v0.dev Safe?
Honest assessment of v0's production readiness.
v0.dev Security Checklist
Pre-launch checklist covering every finding class for v0.
How to Secure v0.dev Apps
Step-by-step hardening guide for v0 deployments.
Can v0.dev Apps Be Hacked?
Attack vectors specific to v0 and how they get exploited.