Allen Disk 1.6 has XSS in the id parameter to downfile.php.

Allen Disk 1.6 has CSRF in setpass.php with an impact of changing a password.

reg.php in Allen Disk 1.6 doesn't check if isset($_SESSION['captcha']['code'])==1, which makes it possible to bypass the CAPTCHA via an empty $_POST['captcha'].

/admin/loginc.php in Allen Disk 1.6 doesn't check if isset($_SESSION['captcha']['code']) == 1, which leads to CAPTCHA bypass by emptying $_POST['captcha'].

Cross-site scripting (XSS) vulnerability in Allen Disk 1.6 allows remote authenticated users to inject arbitrary web script or HTML persistently by uploading a crafted HTML file. The attack vector is the content of this file, and the filename must be specified in the PATH_INFO to readfile.php.

SSRF vulnerability in remotedownload.php in Allen Disk 1.6 allows remote authenticated users to conduct port scans and access intranet servers via a crafted file parameter.