Question 1

What does the Cookie Security Checker test?

Accepted Answer

The Cookie Security Checker fetches your URL and inventories Set-Cookie headers on the response. It flags missing Secure, HttpOnly, and SameSite protections, highlights risky SameSite=None combinations, and surfaces session cookies that may be exposed to script or cross-site abuse.

Question 2

Is this cookie security checker free?

Accepted Answer

Yes. Quick Check is free with no account required. Paste a public HTTPS URL you are authorized to test, submit, and review cookie flag findings in seconds.

Question 3

How do I check cookie security on my website?

Accepted Answer

Enter the login page, checkout flow, or any URL that sets session cookies. Run Quick Check to see each cookie name, flag status, and recommended fixes. Retest after deploying Set-Cookie changes to confirm Secure, HttpOnly, and SameSite behave as intended in production.

Question 4

What are HttpOnly, Secure, and SameSite?

Accepted Answer

HttpOnly blocks JavaScript from reading the cookie — critical for session tokens when XSS is a risk. Secure limits the cookie to HTTPS connections. SameSite controls whether the browser sends the cookie on cross-site requests: Lax or Strict reduces CSRF risk; None requires Secure and is only appropriate for genuine cross-site flows like embedded payments or SSO.

Question 5

How is a cookie checker different from a website security checker?

Accepted Answer

A cookie security checker focuses on session hardening — the Set-Cookie flags that protect authentication state. A broader website security checker tests injection flaws, exposed paths, TLS, headers, and other OWASP-aligned risks across your site. Use both: harden cookies first, then run a full vulnerability scan for defense in depth.

Question 6

When should I run a cookie security check?

Accepted Answer

Run a check after auth changes, framework upgrades, CDN or reverse-proxy moves, payment or SSO integrations, and before launch sign-off. Cookie misconfigurations often survive QA because flows work in the browser even when flags are weak.

Question 7

Can I test login and checkout URLs?

Accepted Answer

Yes, as long as you own the site or have permission to test it. Point the checker at the public URL that issues Set-Cookie headers — typically your sign-in, registration, or checkout entry point — and review the flags on each authentication cookie.

Question 8

How do I fix insecure cookie flags?

Accepted Answer

Start with session and authentication cookies: enable Secure and HttpOnly, then choose SameSite based on your real user journey (Lax for most logins, None only when cross-site behavior is required). See the insecure cookie flags fix guide for stack-specific Set-Cookie examples and retest with this checker.

Cookie Security Checker | Vulnify Free Security Tool

What This Tool Checks

Why It Matters

Best For

What To Do Next

Related Resources

Frequently Asked Questions

Cookie Security Checker | Vulnify Free Security Tool

What This Tool Checks

Why It Matters

Best For

What To Do Next

Related Resources

Frequently Asked Questions

Related Guides

Fix Insecure Cookie Flags

Cookie Security Guide

CSP Checker

Security Headers Analyzer

Cookie Security Explained

How to Scan for Vulnerabilities