Sugar Suite Open Source (SugarCRM) 4.2 and earlier, when register_globals is enabled, does not protect critical variables such as $_GLOBALS and $_SESSION from modification, which allows remote attackers to conduct attacks such as directory traversal or PHP remote file inclusion, as demonstrated by modifying the GLOBALS[sugarEntry] parameter.
https://www.exploit-db.com/exploits/1785
https://exchange.xforce.ibmcloud.com/vulnerabilities/26451
http://www.vupen.com/english/advisories/2006/1791
http://www.securityfocus.com/archive/1/434009/100/0/threaded