- Install and configure helmet with basic CSP in app.js - Restrict CORS to ALLOWED_ORIGIN env var (default localhost:5173) - Add express.json 1mb body size limit to prevent memory exhaustion - Add parseInt+isNaN validation for all :id route params in bills.js and financing.js (GET/PUT/DELETE/:id and PATCH financing-payments/:id) - Extend bills.routes.test.js and financing.routes.test.js with ID validation tests (non-numeric IDs → HTTP 400) Nightshift-Task: security-footgun Nightshift-Ref: https://github.com/marcus/nightshift Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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