Calcium contains a flaw that allows a remote cross site scripting attack. This flaw exists because the application does not validate the 'EventText' variable upon submission to the 'Calcium' script during the creation of a new event. 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.
Classification
Location:
Remote / Network Access
Attack Type:
Input Manipulation
Impact:
Loss of Integrity
Exploit:
Exploit Public
Disclosure:
OSVDB Verified
OSVDB:
Web Related
Technical
This vulnerability is only present if you allow untrusted users to add events to a calendar, and have the calendar set to process HTML in events.
Solution
Currently, there are no known upgrades or patches to correct this issue. It is possible to correct the flaw by implementing the following workaround: Disable the "HTML in Events" setting (enabled by default) on the "Display Settings" administration menu.
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