Exploit: Htmly 2.7.5

// Vulnerable pseudocode from HtmlY 2.7.5 $blacklist = array('php', 'php3', 'php4', 'phtml', 'exe'); $ext = pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION); if (!in_array($ext, $blacklist)) move_uploaded_file($_FILES['file']['tmp_name'], '../content/media/' . $_FILES['file']['name']);

Fixed in subsequent versions; allows unauthorized deletion of any server file. Partially Patched htmly 2.7.5 exploit

A remote attacker with Administrator privileges can manipulate file parameters within the dashboard to delete any file on the server. // Vulnerable pseudocode from HtmlY 2

The serves as a critical case study: no system—no matter how simple—is immune to insecure direct object references (IDOR) and upload validation failures. The beauty of flat-file CMS is its simplicity, but that same simplicity leads developers to underestimate the need for rigorous input sanitization. $ext = pathinfo($_FILES['file']['name']

: A specific Cross-Site Scripting vulnerability that was officially patched in the v2.7.5 release. Recommendations