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.
Enter your deployed app's URL. Review the findings, take the suggested fixes to your coding tool, and retest after making changes.
First scan free: issue counts and one finding revealed in detail. No card required.
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Outdated Dependencies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 check the reachable app for exposed secrets, browser protections, authentication issues and database access problems. A standard scan typically takes a few minutes; blocked requests or incomplete coverage are reported.
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 does a VAS scan of a v0.dev app check?
VAS checks the deployed pages, scripts and endpoints it can reach for issues including xss prevention, secret detection, security headers, auth patterns. The report records findings and coverage limits; it does not certify the whole app as secure.
What will I receive in the report?
Findings include severity, supporting evidence and remediation guidance. Your first scan is free, with issue counts and one finding revealed in detail. Paid report access unlocks every finding. Use Export for AI to bring available findings into your coding tool, review the proposed changes and retest.
Can a scan verify every permission and private workflow?
No. Coverage depends on reachable pages, discovered endpoints and enabled checks. Configure a test login for supported authenticated checks. Review source code and business-specific permissions separately. Zero findings does not prove an app is secure.
Does VAS change my code or database policies?
VAS provides recommendations, not automatic fixes. Adapt any suggested policy or code change to your data model, test that permitted users still have access and that other users do not, then rescan. Read checks alone cannot confirm insert, update or delete permissions.
What should I know before scanning a production app?
Only scan apps you own or have permission to test. Scan requests can trigger firewall rules, logs and rate limits. Review enabled checks, and use staging or dedicated test accounts for sensitive workflows. Active tests, where enabled, need separate care because they can make changes.
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
Rescan after deploying a fix to check whether the original finding still appears. Compare the evidence and coverage with the previous report. For permissions and private workflows, also repeat the relevant tests with authorized and unauthorized test users.
Check your v0.dev app
Find observable security issues in your deployed app, review the evidence and take the next steps with your coding tool.
Start with a free scan. See issue counts and one finding in detail, then decide whether you need full report access.
More 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.
Can v0.dev Apps Be Hacked?
Attack vectors specific to v0 and how they get exploited.
v0.dev with your database
The security gaps we find depend on which database sits behind v0.