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Test your applicationsUpgrade RHEL:7 samba-libs to version 0:4.4.4-13.el7_3 or higher.
This issue was patched in RHSA-2017:1265.
Note: Versions mentioned in the description apply only to the upstream samba-libs package and not the samba-libs package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
It was found that Samba before versions 4.5.3, 4.4.8, 4.3.13 always requested forwardable tickets when using Kerberos authentication. A service to which Samba authenticated using Kerberos could subsequently use the ticket to impersonate Samba to other services or domain users.