After the initial setup process, some steps of setup.php file are reachable not only by super-administrators, but by unauthenticated users as well. Malicious actor can pass step checks and potentially change the configuration of Zabbix Frontend.
lists.debian.org/debian-lts-announce/2022/02/msg00008.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6SZYHXINBKCY42ITFSNCYE7KCSF33VRA/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB6W556GVXOKUYTASTDGL3AI7S3SJHX7/
support.zabbix.com/browse/ZBX-20384