It has been reported that Chi Kien Uong Guestbook may be prone to a cross-site scripting vulnerability that may allow a remote attacker to execute HTML or script code in a user's browser. The problem is reported to present itself due to insufficient sanitization of user-supplied data when posting an e-mail address or URL to the site. It has been reported that double quotes are not filtered therefore an attacker may be able to append malicious script code in order to be executed on a victim's web browser.
Successful exploitation of this attack may allow an attacker to steal cookie-based authentication information.
Chi Kien Uong Guestbook contains a flaw that allows a remote Cross Site Scripting attack. This flaw exists because the application does not validate the URL and email parameters upon submission. This could allow a user to send a specially crafted request that would execute arbitrary code on the server leading to a loss of integrity.
Currently, there are no known upgrades, patches, or workarounds available to correct this issue.