Security vulnerabilities and automated fixes for injection prevention issues
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A high-severity security vulnerability was discovered in a React-Express booking application where the Express backend lacked CSRF middleware protection, while the frontend's coupon code input field in `Listing.jsx` allowed unrestricted user input. The fix implemented strict input validation using a regex pattern that whitelists only alphanumeric characters, hyphens, and underscores, preventing malicious payloads from reaching backend database operations.