Execution of Ansible playbooks on Windows platforms with PowerShell ScriptBlock logging and Module logging enabled can allow for 'become' passwords to appear in EventLogs in plaintext. A local user with administrator privileges on the machine can view these logs and discover the plaintext password. Ansible Engine 2.8 and older are believed to be vulnerable.
https://github.com/ansible/ansible/pull/49142
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16859
https://access.redhat.com/errata/RHSA-2018:3773
https://access.redhat.com/errata/RHSA-2018:3772
https://access.redhat.com/errata/RHSA-2018:3771
https://access.redhat.com/errata/RHSA-2018:3770
http://www.securityfocus.com/bid/106004
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00077.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00021.html