The remote host is vulnerable to a cross-site scripting (XSS) attack.
The remote host is running a vulnerable WackoWiki, a lightweight Wiki-clone implemented in PHP. It is reported that WackoWiki R3.5 is susceptible to a cross-site scripting vulnerability in its textsearch form. This may allow for theft of cookie-based authentication credentials or other attacks.
Upgrate to WackoWiki R4.0 or higher.