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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

Security Advisory Details

Vulnerability Descriptions

Authorization issue allows Customer to see internal Ticket information

An attacker with the permissions of a Ticket customer can access internal information about its own account, the Ticket history and related Tickets. It's also possible for the unauthorized user to access the recent Tickets, merge Tickets and split Ticket functionality that should be only accessible for agent Users.

Recommended Resolution

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.

Additional information

Online version of this advisory:

Send all remarks to security issues to security @