The remote host is vulnerable to an HTML Injection attack.
The remote host is running Yappa-NG, a web-based photo album. This version is vulnerable to several remote script injection flaws. An attacker exploiting these flaws would typically need to be able to convince a user to browse a malicious URI. Successful exploitation would result in the execution of script code which could cause a loss of confidential data.
Upgrade to version 2.3.2 or higher.