Znuny before LTS 6.5.1 through 6.5.10 and 7.0.1 through 7.0.16 allows XSS. JavaScript code in the short description of the SLA field in Activity Dialogues is executed.
{ "binaries": [ { "binary_version": "6.5.6-1", "binary_name": "otrs2" }, { "binary_version": "6.5.6-1", "binary_name": "znuny" } ] }