Secunia

Some vulnerabilities have been reported in Joomla!, which can be exploited by malicious users to conduct script insertion attacks and by malicious people to conduct cross-site request forgery attacks.

1) Some vulnerabilities are caused due to various components and modules for Joomla! allowing users to perform certain actions via HTTP requests, without performing any validity checks to verify the request. This can be exploited to e.g. add new super administrators.

2) Input passed via the poll options and the poll title in the com_poll component is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when viewing a page containing a malicious poll.

Successful exploitation requires privileges to edit polls.

Solution
Restrict access to trusted users only and edit the source code to ensure that input is properly sanitised. Do not browser other websites while being logged in into Joomla!.
Further details available in Customer Area

Provided and/or discovered by
1) Armando Romeo aka Zinho and Jose Carlos Nieto
2) Armando Romeo aka Zinho

Original Advisory
1) http://www.hackerscenter.com/archive/view.asp?id=28138
2) http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=7358

Deep Links
Links available in Customer Area