CORS wide open in Firebase
highUpdated Oct 12, 2026
The Firebase client SDK is meant to run in the browser. Rules decide access.
Fix for Firebase
The Firebase client SDK is meant to run in the browser. Rules decide access. A wildcard on your own Cloud Function or Route Handler is a separate choice. Allowlist origins there the same way.
The five-minute check, the other platforms, and the agent prompt are on the full guide. More Firebase fixes are on the Firebase page.