Cloudflare Security

Cloudflare Security Scanner

Behind Cloudflare? The edge stops a lot of traffic. It cannot stop your app returning the wrong user's data.

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.

View a sample security report

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.

HIGH

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.

MEDIUM

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.

HIGH

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.

MEDIUM

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

Edge config audit

Header verification

Origin exposure check

Workers review

Backend access test

Fix recommendations

Config templates

Verification

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 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 Cloudflare.

Common Questions About Cloudflare Security

What does a VAS scan of a Cloudflare app check?

VAS checks the deployed pages, scripts and endpoints it can reach for issues including header coverage, origin exposure, workers auth, backend access. 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 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

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 Cloudflare 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.