code-projects Voting System CVE-2025-11421

The primary remediation is to upgrade to a patched version if available from the vendor at code-projects.org; however, no patched version number is confirmed in available data. Immediate compensating controls: (1) Apply HTML entity encoding (htmlspecialchars() with ENT_QUOTES flag in PHP) to all output of the Firstname, Lastname, and Platform fields in both edit forms and candidate display pages to prevent XSS execution. (2) Implement input validation to reject or strip script tags and event handlers from these fields on both client and server side. (3) Restrict access to /admin/candidates_edit.php to only administrative users with verified need, using role-based access control (RBAC), reducing the pool of potential attackers. (4) Enable Content Security Policy (CSP) headers with script-src 'self' to limit inline script execution. These controls address the root cause (improper output encoding) without requiring application restart. Note that input validation alone is insufficient without output encoding, as data may be legitimately stored and later displayed in contexts where encoding is essential.