Please read carefully and check if the version of your Zammad system is affected by this vulnerability. Please send information regarding vulnerabilities in Zammad to: security at zammad.com
An error in the authorization logic allows Users with admin. Permissions but without ticket. Permissions to access Tickets. An attacker could gain access to information without proper authorization check.
This vulnerability is fixed in the latest versions of Zammad and it is recommended to upgrade to one of these.
Fixed releases can be found at:
Or just update your Zammad if installed via OS package manager.
Online version of this advisory: https://zammad.com/news/security-advisory-zaa-2020-19
Send all remarks to security issues to security @ zammad.com.