Ignite Realtime Openfire before 3.6.5 does not properly implement the register.password (aka canChangePassword) console configuration setting, which allows remote authenticated users to bypass intended policy and change their own passwords via a passwd_change IQ packet.
https://exchange.xforce.ibmcloud.com/vulnerabilities/50291
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-1591
http://www.securityfocus.com/bid/34804
http://www.igniterealtime.org/issues/browse/JM-1532