AUTH-003high SeverityBroken Authentication & Access Controls
No Wildcard CORS on Authenticated API Endpoints
To fix cross-origin browser errors during development, agents frequently add Access-Control-Allow-Origin: * to all responses.
1-Click Fix Prompt for Cursor & Claude Code
Review my codebase for "No Wildcard CORS on Authenticated API Endpoints" (AUTH-003). Issue: To fix cross-origin browser errors during development, agents frequently add Access-Control-Allow-Origin: * to all responses. Remediation required: Set CORS origin strictly to your production domain or explicit staging origins on authenticated endpoints. Please: 1. Locate any occurrences of this issue across my repository. 2. Refactor the code to follow production standards without breaking existing functionality. 3. Provide a clear command or step to test and verify the fix.
Why AI Assistants Write This Bug
To fix cross-origin browser errors during development, agents frequently add Access-Control-Allow-Origin: * to all responses.
AI code generation prioritizes immediate syntax execution over production edge cases. When an assistant hits an undefined variable or strict type error, it frequently takes the path of least resistance rather than implementing standard pre-launch security patterns.
Code Comparison
Common AI Code PatternVulnerable
// Vulnerable AI-generated pattern for: No Wildcard CORS on Authenticated API Endpoints
// Insecure route handler trusting body user ID (IDOR risk)
export async function POST(req: Request) {
const { userId, newEmail } = await req.json();
// BUG: Any user can modify any other user record!
await db.user.update({ where: { id: userId }, data: { email: newEmail } });
return Response.json({ success: true });
}Launch-Ready Fix
// Production-ready fix for: No Wildcard CORS on Authenticated API Endpoints
// Protected route deriving identity from verified session
export async function POST(req: Request) {
const session = await auth();
if (!session?.user?.id) {
return Response.json({ error: "Unauthorized" }, { status: 401 });
}
const { newEmail } = await req.json();
// Scoped strictly to authenticated session user ID
await db.user.update({ where: { id: session.user.id }, data: { email: newEmail } });
return Response.json({ success: true });
}Remediation & Verification Checklist
Remediation: Set CORS origin strictly to your production domain or explicit staging origins on authenticated endpoints.
- Search your codebase for pattern matching "No Wildcard CORS on Authenticated API Endpoints".
- Apply the recommended remediation: Set CORS origin strictly to your production domain or explicit staging origins on authenticated endpoints.
- Run local build and test commands to ensure no regressions.
- Verify in your browser or with curl that the issue is resolved.
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