Preventing Cross-Site Scripting via Recursive Input Sanitization

Public inputs are the primary entry point for web exploits. Attackers continuously try to inject malicious HTML, script tags, or inline event handlers into input fields, hoping the server will persist the payload and execute it inside an administrative dashboard. To maintain complete security, Zero CMS implements a robust, zero-dependency recursive input sanitizer natively.

Our recursive input cleaner recursively traverses all nested arrays, sanitizing both keys and values. It physically strips null-bytes, malformed Unicode characters, and dangerous HTML tags completely out of the markup, while preserving passwords as clean, un-mutilated standard strings, providing an enterprise-grade defense against injection exploits.

By recursively sanitizing public inputs natively, Zero CMS completely protects the back-office administrative panel from persistent XSS exploits. When administrators view form submissions or moderate blog comments, there are no unverified, malicious scripts executing inside their browser sessions.

This robust recursive sanitizer is integrated directly inside our core security class (**`Security.php`**). By writing direct, clean recursive loops, we achieve high-speed input cleaning with zero library overhead, providing an enterprise-grade, highly resilient defense against injection exploits on bare metal.