Claude Code
auth
CORS Wildcard Allow-Origin Too Permissive
CORS configured with Access-Control-Allow-Origin: * allowing any origin to access the API. Security audit flags this as a vulnerability. Any website can make requests to the API on behalf of users.
While allowing all origins is convenient for development, it's a security risk in production.
Error Messages You Might See
Security audit: CORS wildcard origin
OAuth token vulnerability from CORS misconfiguration
CSRF risk from overly permissive CORS
Common Causes
- Wildcard used for simplicity during development and never changed for production
- CORS allowed for all endpoints including sensitive ones
- Misunderstanding that wildcard is safe (it's not)
- No authentication on API endpoints, relying on origin restriction
- CORS configured globally without considering security implications
How to Fix It
Replace * with specific domains: Access-Control-Allow-Origin: https://trusted.example.com. For multiple domains: check Origin header, return specific domain if in whitelist. Only allow CORS for non-sensitive endpoints. Sensitive operations (delete, payment) should require stronger auth. Always combine with authentication (JWT tokens), don't rely on origin alone.
Real developers can help you.
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
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Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
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🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
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Milan is always happy to connect, work on new ideas, and explore the latest in technology.
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Based in Poland (CET timezone). Available for async work and calls during EU/US business hours.
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Get HelpFrequently Asked Questions
Why is Access-Control-Allow-Origin: * unsafe?
Any website can make authenticated requests on user's behalf. If user logged in, attacker's site can call API as that user.
How to allow multiple specific origins?
Check Origin header. If in whitelist, return it: Access-Control-Allow-Origin: origin (where origin is the value sent).
Should sensitive APIs allow CORS?
No. CORS should only apply to read-only or public APIs. Sensitive operations (delete, payment) should require stronger auth.