NukeCalendar, which is a third-party calendar module for PHP-Nuke, is prone to multiple vulnerabilities.
These issues include path disclosure, SQL injection and cross-site scripting. Possible consequences include disclosure of sensitive information and account/bulletin board compromise. Attacks against the database implementation itself are also possible through SQL injection.
http://www.example.com/nuke71/modules.php?op=modload&name=Kalender&file=index&type=view&eid=[xss code here]
The NukeCalendar (KalenderMx) module for PHP-Nuke contains a flaw that allows a remote cross site scripting attack. This flaw exists because the application does not validate 'eid' variables upon submission to the module. This could allow a user to create a specially crafted URL that would execute arbitrary code in a user's browser within the trust relationship between the browser and the server, leading to a loss of integrity.
Currently, there are no known upgrades, patches, or workarounds available to correct this issue.