Fix BOLA (Broken Object Level Authorization) in Qwik
BOLA (Broken Object Level Authorization) is the #1 vulnerability in modern APIs and meta-frameworks like Qwik. In Qwik, this usually manifests in 'routeLoader$' or 'server$' functions where a developer trusts a user-supplied ID from the URL or request body without verifying ownership. If you aren't checking if the 'current_user_id' matches the 'resource.owner_id' on every single request, you're leaking data.
The Vulnerable Pattern
import { routeLoader$ } from '@builder.io/qwik-city'; import { createConnection } from './db';// VULNERABLE: Direct access to object via ID without ownership validation export const useGetInvoice = routeLoader$(async (requestEvent) => { const invoiceId = requestEvent.params.id; const db = await createConnection();
// Hacker can change the ID in the URL to view any user’s invoice const invoice = await db.query(‘SELECT * FROM invoices WHERE id = ?’, [invoiceId]);
if (!invoice) { throw requestEvent.error(404, ‘Invoice not found’); }
return invoice; });
The Secure Implementation
The fix involves two critical steps: 1) Identity Verification: Extracting the user's identity from a secure session/JWT rather than trusting client-side input. 2) Authorization Enforcement: Modifying the database query to include the user_id in the WHERE clause. This ensures that even if an attacker guesses a valid invoice UUID, the database returns null because the 'user_id' constraint isn't met. We return a 404 instead of a 403 to prevent 'Insecure Direct Object Reference' discovery via status code analysis.
import { routeLoader$ } from '@builder.io/qwik-city'; import { createConnection } from './db'; import { getSession } from './auth-utils';// SECURE: Validates ownership at the database query level export const useGetInvoice = routeLoader$(async (requestEvent) => { const session = await getSession(requestEvent.sharedMap); if (!session?.user) { throw requestEvent.error(401, ‘Unauthorized’); }
const invoiceId = requestEvent.params.id; const db = await createConnection();
// Enforcement: Filter by both resource ID AND owner ID const invoice = await db.query( ‘SELECT * FROM invoices WHERE id = ? AND user_id = ?’, [invoiceId, session.user.id] );
if (!invoice || invoice.length === 0) { // Use 404 to prevent resource enumeration throw requestEvent.error(404, ‘Invoice not found’); }
return invoice[0]; });
Your Qwik API
might be exposed to BOLA (Broken Object Level Authorization)
74% of Qwik apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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