Unrestricted file upload vulnerability in Collabtive 0.4.8 allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension and using a text/plain MIME type, then accessing it via a direct request to the file in files/, related to (1) the showproject action in managefile.php or (2) the Messages feature.
https://www.exploit-db.com/exploits/7076
https://exchange.xforce.ibmcloud.com/vulnerabilities/46498
http://www.securityfocus.com/bid/32229
http://www.securityfocus.com/archive/1/498186/100/0/threaded