CVE-2021-27927

In Zabbix from 4.0.x before 4.0.28rc1, 5.0.0alpha1 before 5.0.10rc1, 5.2.x
before 5.2.6rc1, and 5.4.0alpha1 before 5.4.0beta2, the
CControllerAuthenticationUpdate controller lacks a CSRF protection
mechanism. The code inside this controller calls diableSIDValidation inside
the init() method. An attacker doesn’t have to know Zabbix user login
credentials, but has to know the correct Zabbix URL and contact information
of an existing user with sufficient privileges.