source: https://www.securityfocus.com/bid/25803/info
     
JSPWiki is prone to multiple input-validation vulnerabilities, including multiple cross-site scripting issues and an HTML-injection issue, because the application fails to adequately sanitize user-supplied input.
     
Attacker-supplied HTML and script code will run in the context of the affected site, 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.
     
Versions prior to JSPWiki 2.5.138-beta are vulnerable. 

http://www.example.com/wiki/Diff.jsp?page=Administrator&r1=[XSS]&r2=[XSS]