Reportedly Verylost lostBook is affected by an HTML injection vulnerability in its message entry functionality. This issue is due to a failure of the application to properly validate and sanitize user-supplied input before including it in dynamically generated web page content.
This may allow an attacker inject malicious HTML and script code into the application. An unsuspecting user viewing the post will have the attacker-supplied script code executed within their browser in the context of the vulnerable site. This issue may be leverage to steal cookie based authentication credentials. Other attacks are also possible.
lostBook Guest Book Multiple Field Script Insertion
Remote / Network Access
Loss of Integrity
Currently, there are no known upgrades, patches, or workarounds available to correct this issue.