source: http://www.securityfocus.com/bid/46888/info

Wikiwig is prone to a cross-site scripting vulnerability and an HTML-injection vulnerability because it fails to properly sanitize user-supplied input before using it in dynamically generated content.

Successful exploits will allow attacker-supplied HTML and script code to run in the context of the affected browser, potentially allowing the attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user. Other attacks are also possible.

Wikiwig 5.01 is vulnerable; other versions may also be affected. 

http://www.example.com/wikiwig5.01/_wk/Xinha/plugins/SpellChecker/spell-check-savedicts.php?to_r_list=%3Cscript%3Ealert(0)%3C%2fscript%3E