---
issue: 095
title: "Backend: getUserStats has no ownership/admin check (IDOR)"
severity: medium
domain: Payment
labels: [security, backend, idor]
status: open
created: 2026-05-30
source: Full Codebase Audit 2026-05-30
---

# Backend: getUserStats has no ownership/admin check (IDOR)

**Severity:** medium
**Domain:** Payment
**Labels:** security, backend, idor

## Description

`paymentControllerRoutes.ts:13` serves `GET /api/payment/stats/:userId` without checking that `req.user.id === req.params.userId` or that the caller is an admin. Any authenticated user can retrieve payment statistics for any other user ID.

## Options

1. Require `req.user.id === req.params.userId`, or admin.
2. Admin-only endpoint.
3. Scope query to the authenticated user, ignore param.

## Recommendation

Require self-or-admin (`req.user.id === userId || isAdmin`).

## Affected Files

- `backend/src/services/payment/paymentControllerRoutes.ts:13`

## References

- [Full Codebase Audit 2026-05-30](../09%20-%20Audits/Full%20Codebase%20Audit%20-%202026-05-30.md) — DEC-29