When dynamic templates are used (OTRSTicketForms), admin can use OTRS tags which are not masked properly and can reveal sensitive information. This issue affects: OTRS AG OTRSTicketForms 6.0.x version 6.0.40 and prior versions; 7.0.x version 7.0.29 and prior versions; 8.0.x version 8.0.3 and prior versions.
https://otrs.com/release-notes/otrs-security-advisory-2020-17/