source: https://www.securityfocus.com/bid/13522/info

MegaBook is prone to a cross-site scripting vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input.

An attacker may leverage this issue to have arbitrary script code executed in the browser of an unsuspecting user. This may facilitate the theft of cookie-based authentication credentials as well as other attacks.

This issue is reported to affect MegaBook version 2.0; other versions may also be vulnerable. 

http://www.example.com/admin.cgi?action=modifypost&entryid=">&lt;script&gt;alert('wvs-xss-magic-string-703410097');&lt;/script&gt;