Cloudflare Security Scanner
Behind Cloudflare? The edge stops a lot of traffic. It cannot stop your app returning the wrong user's data.
Our automated security scanner analyzes your Cloudflare application for vulnerabilities, misconfigurations, and exposed secrets. Get a comprehensive security report in minutes, not days.
Cloudflare Security Considerations
Cloudflare makes development fast, but AI-generated code often skips security best practices:
- !Edge protection does not cover application-layer authorization
- !Origin server reachable directly if its IP leaks
- !Workers and Pages Functions shipping without auth checks
- !Security headers assumed to be handled by the proxy
Where Security Breaks in Cloudflare Apps
Built on Supabase (Postgres + RLS), Cloudflare applications share a recognizable fingerprint, which means attackers and automated scanners find them the same way every time. Based on real vulnerability patterns in Cloudflare deployments, the breakdown is 0 critical-impact issues, 2 high-impact, and 2 medium-or-lower.
Edge protection does not cover application
layer authorization
Fix: Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
Origin server reachable directly if its IP leaks
A common failure mode in Cloudflare applications: origin server reachable directly if its ip leaks. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
Fix: Scan your deployed application with a security tool that understands this stack. Address the specific findings — generic best practices don't catch platform-specific misconfigurations.
Workers and Pages Functions shipping without auth checks
A common failure mode in Cloudflare applications: workers and pages functions shipping without auth checks. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
Fix: Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
Security headers assumed to be handled by the proxy
A common failure mode in Cloudflare applications: security headers assumed to be handled by the proxy. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
Fix: Configure Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, and X-Content-Type-Options in your hosting platform's config.
What We Check
Header Coverage
Verify headers actually reach the browser.
Origin Exposure
Check the origin is not directly reachable.
Workers Auth
Test Workers and Functions for open endpoints.
Backend Access
Check the database behind the edge.
What You'll Get
Why Cloudflare Apps Need Security Scanning
Cloudflare is the most common thing we see in front of the apps we scan. It is very good at what it does, and none of what it does involves checking whether your API route verifies record ownership.
vas scans past the edge to the application behind it, which is where the findings actually are.
How Cloudflare Security Scanning Works
Submit Your URL
Enter your Cloudflare application URL. Our scanner automatically detects your tech stack and configures the appropriate security checks for Cloudflare.
Automated Analysis
We scan for exposed secrets, security headers, authentication issues, database misconfigurations, and Cloudflare-specific vulnerabilities. A deep scan typically completes in 20-30 minutes.
Get Actionable Results
Receive a detailed report with prioritized vulnerabilities, severity ratings, and step-by-step remediation guidance with code examples specific to Cloudflare.
Common Questions About Cloudflare Security
What vulnerabilities are most common in Cloudflare apps?
The top finding classes in Cloudflare apps: edge protection does not cover application; origin server reachable directly if its ip leaks; workers and pages functions shipping without auth checks.
What does a vas scan of a Cloudflare app check?
The scan probes your deployed app for the specific findings above: header coverage, origin exposure, workers auth, backend access. 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. A deep scan typically finishes in 20-30 minutes and will not impact application availability.
Remediation Playbook for Cloudflare
Priority-ordered fixes for the specific findings we see in Cloudflare 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 Cloudflare stack.
1. Edge protection does not cover application
Why it matters: layer authorization
How to close it: Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
2. Origin server reachable directly if its IP leaks
Why it matters: A common failure mode in Cloudflare applications: origin server reachable directly if its ip leaks. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
How to close it: Scan your deployed application with a security tool that understands this stack. Address the specific findings — generic best practices don't catch platform-specific misconfigurations.
3. Workers and Pages Functions shipping without auth checks
Why it matters: A common failure mode in Cloudflare applications: workers and pages functions shipping without auth checks. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
How to close it: Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
4. Security headers assumed to be handled by the proxy
Why it matters: A common failure mode in Cloudflare applications: security headers assumed to be handled by the proxy. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
How to close it: Configure Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, and X-Content-Type-Options in your hosting platform's config.
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 Cloudflare App
Don't let vulnerabilities compromise your hard work. Security issues in Cloudflare 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 your first scan free, in minutes. Scan before you launch and deploy with confidence knowing your application meets security best practices.
More on Cloudflare Security
Every angle of Cloudflare security, from the specific findings we detect to step-by-step fixes.
Cloudflare Security Risks
Specific risks we find in Cloudflare apps, with real-world examples.
Cloudflare Security Issues
Issues grouped by severity with detection and fix steps.
Cloudflare Best Practices
Remediation playbook derived from Cloudflare's actual failure modes.
Is Cloudflare Safe?
Honest assessment of Cloudflare's production readiness.
Cloudflare Security Checklist
Pre-launch checklist covering every finding class for Cloudflare.
How to Secure Cloudflare Apps
Step-by-step hardening guide for Cloudflare deployments.