PAY-001critical SeverityPayment Processing & Webhook Integrity
Stripe Webhook Signature Verification Mandatory
Agents parse req.body as plain JSON and process checkout events without running stripe.webhooks.constructEvent().
1-Click Fix Prompt for Cursor & Claude Code
Review my codebase for "Stripe Webhook Signature Verification Mandatory" (PAY-001). Issue: Agents parse req.body as plain JSON and process checkout events without running stripe.webhooks.constructEvent(). Remediation required: Verify raw request payload using stripe.webhooks.constructEvent(rawBody, signature, secret) before trusting any event. 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
Agents parse req.body as plain JSON and process checkout events without running stripe.webhooks.constructEvent().
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: Stripe Webhook Signature Verification Mandatory
// 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: Stripe Webhook Signature Verification Mandatory
// 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: Verify raw request payload using stripe.webhooks.constructEvent(rawBody, signature, secret) before trusting any event.
- Search your codebase for pattern matching "Stripe Webhook Signature Verification Mandatory".
- Apply the recommended remediation: Verify raw request payload using stripe.webhooks.constructEvent(rawBody, signature, secret) before trusting any event.
- 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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