make_catalog_backup in Bacula 2.2.5, and probably earlier, sends a MySQL password as a command line argument, and sometimes transmits cleartext e-mail containing this command line, which allows context-dependent attackers to obtain the password by listing the process and its arguments, or by sniffing the network.
https://exchange.xforce.ibmcloud.com/vulnerabilities/37336
http://security.gentoo.org/glsa/glsa-200807-10.xml