# Permissive CORS Configuration

- ID: go-permissive-cors
- Severity: MEDIUM
- CWE: CWE-942 (CWE-942)
- Languages: Go
- Frameworks: gin, echo, fiber, chi, gorilla

## Description

CORS allows wildcard origin or reflects Origin header without validation.

## Detection Message

CORS policy allows untrusted origins

## Remediation

Whitelist specific allowed origins instead of using wildcards.

```go
allowedOrigins := map[string]bool{
    "https://app.example.com": true,
}

origin := r.Header.Get("Origin")
if allowedOrigins[origin] {
    w.Header().Set("Access-Control-Allow-Origin", origin)
}
```

Learn more: https://shoulder.dev/learn/go/cwe-942/permissive-cors

## Documentation

[object Object]

## Related Rules

- **FastAPI CORS Misconfiguration** [MEDIUM]: 
- **Flask CORS Misconfiguration** [MEDIUM]: 
- **Chi Permissive CORS** [MEDIUM]: 
- **Echo Permissive CORS** [MEDIUM]: 
- **Fiber Permissive CORS** [MEDIUM]: