PAY-009critical SeverityPayment Processing & Webhook Integrity
Payment Entitlements Verified Server-Side in Database
Some AI apps read user tier from a client localStorage item or unverified session claim, allowing users to unlock features with DevTools.
1-Click Fix Prompt for Cursor & Claude Code
Review my codebase for "Payment Entitlements Verified Server-Side in Database" (PAY-009). Issue: Some AI apps read user tier from a client localStorage item or unverified session claim, allowing users to unlock features with DevTools. Remediation required: Query user subscription tier and entitlement status directly from your database on every paid feature request. 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
Some AI apps read user tier from a client localStorage item or unverified session claim, allowing users to unlock features with DevTools.
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: Payment Entitlements Verified Server-Side in Database
// Flawed Stripe webhook handler
export async function POST(req: Request) {
const body = await req.json(); // BUG: Fails signature verification!
const signature = req.headers.get("stripe-signature");
// Unhandled events drop silently
return Response.json({ received: true });
}Launch-Ready Fix
// Production-ready fix for: Payment Entitlements Verified Server-Side in Database
// Fixed Stripe webhook with raw text buffer
export async function POST(req: Request) {
const body = await req.text(); // Raw text preserves HMAC signature
const signature = req.headers.get("stripe-signature");
const event = stripe.webhooks.constructEvent(body, signature!, process.env.STRIPE_WEBHOOK_SECRET!);
// Acknowledge receipt with 200
return Response.json({ received: true }, { status: 200 });
}Remediation & Verification Checklist
Remediation: Query user subscription tier and entitlement status directly from your database on every paid feature request.
- Search your codebase for pattern matching "Payment Entitlements Verified Server-Side in Database".
- Apply the recommended remediation: Query user subscription tier and entitlement status directly from your database on every paid feature request.
- 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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