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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

Application Functionality Can Be Used to perform Server-Side Request Forgery

The Zammad application's SMS configuration interface for Massenversand is implemented in a way that it renders the result of the test request to the User. An attacker can use this to request any URL via a GET request from the network interface of the server. This may lead to disclosure of information from internal systems.

Special 🙏 and 🤘 and ❤️ to:

N: Michał Błaszczak
C: Zdalny Admln

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 @