ZOHO ManageEngine ADSelfService Plus before 4.5 Build 4500 allows remote attackers to reset user passwords, and consequently obtain access to arbitrary user accounts, by providing a user id to accounts/ValidateUser, and then providing a new password to accounts/ResetResult.
https://exchange.xforce.ibmcloud.com/vulnerabilities/65348
http://www.vupen.com/english/advisories/2011/0392
http://www.securityfocus.com/archive/1/516396/100/0/threaded