This script is Copyright (C) 2005-2017 Tenable Network Security, Inc.
The remote web server contains a PHP script that is vulnerable to a
cross-site scripting issue.
The remote host is running Advanced Guestbook, a free guestbook
written in PHP.
The installed version of Advanced Guestbook fails to properly sanitize
the 'HTTP_USER_AGENT' environment variable before using it in
dynamically-generated content. An attacker can exploit this flaw to
launch cross-site scripting attacks against the affected application.
See also :
Upgrade to Advanced Guestbook version 2.3.3 or later.
Risk factor :
Medium / CVSS Base Score : 4.3
CVSS Temporal Score : 4.1
Public Exploit Available : true