Free CORS Policy Checker
Validate Access-Control headers, credentials safety, and simulate preflight behavior.
Fix misconfigurations like wildcard with credentials and missing Vary: Origin.
- ACAO configuration
- Preflight simulation
- Credentials safety
"The ROI has been exceptional. We've prevented three potential security incidents in the first quarter alone, and the platform pays for itself in risk mitigation."
— Elena Rodriguez
VP of Engineering
"We identified and fixed critical vulnerabilities before our platform launch, saving us from potential data breaches."
— Marcus Anderson
CTO
"Implementation was seamless and continuous monitoring gives our team confidence. We've seen a 40% reduction in security incidents since adopting Barrion."
— David Kim
Chief Security Officer
"The automated scanning and detailed reporting have transformed our security posture. We've reduced our vulnerability remediation time from weeks to days."
— Priya Sharma
Security Director
"Barrion's passive scanning approach means zero impact on our production systems while providing security insights. Perfect for our high-traffic environment."
— Robert Taylor
DevOps Lead
"The reporting feature saved us weeks of manual work during our SOC 2 audit. The automated report generation is a game-changer."
— Michael Brown
Compliance Officer
"Barrion's security scanning has helped us implement best security practices efficiently, saving us countless hours."
— Sarah Chen
Head of Security
"Barrion gives us peace of mind, knowing we're notified of any security issues. Exactly what our team needed."
— Oskar Nilsson
Tech Lead
"The detailed vulnerability reports and remediation guidance have been invaluable. Our development team can now address issues proactively rather than reactively."
— Amanda Foster
Engineering Manager
"Barrion's real-time alerts have helped us catch and fix vulnerabilities before they become critical issues. The peace of mind is worth every penny."
— Jennifer Martinez
Security Architect
"We needed a solution that could scale with our growing infrastructure. Barrion has exceeded expectations and become an essential part of our security toolkit."
— Lisa Wang
Infrastructure Director
Scan in three simple steps
Fast, safe, non-intrusive checks with actionable results.
Start scan
Enter your URL, and click the start scan button to begin.
Scan runs
Barrion performs passive, read-only security checks with minimal site impact.
Take Action
Fix issues with step-by-step guidance and enable monitoring for continuous protection.
What is CORS?
Cross‑Origin Resource Sharing (CORS) controls which origins can read your API responses in browsers. Correct configuration prevents data exfiltration while allowing legitimate cross‑site apps.
Why CORS matters
A lax policy can expose private data to attacker-controlled origins. Overly strict settings break legitimate clients. The goal is least‑privilege, origin‑scoped access.
What this checker validates
- ACAO/ACAC/ACAH/ACEH values and consistency
- Credentials with wildcard origin (disallowed)
- Preflight handling (methods/headers) and Vary: Origin
- Max‑Age and exposure of sensitive headers
How to fix common failures
- When using credentials, set ACAO to the specific request origin, not "*"
- Return Vary: Origin so caches keep responses per origin
- Limit ACEH to required headers only
- Whitelist only necessary methods in preflight
Tool-specific questions
Can I use * with credentials?
Do I need Vary: Origin?
Should I expose Authorization?
How do I debug preflight failures?
Why Choose Barrion?
Real-Time Results
Instant security analysis with detailed reports, giving you an immediate security overview
Comprehensive Checks
Multiple best-practice security checks in a single scan, for broad coverage
Actionable and Effective
Clear recommendations for fixes, helping you improve your security quickly and effectively
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