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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

Stored XSS in Tags element

Zammad comes with a functionality to add Tags to Tickets. Added Tags are shown to the Agent in the Ticket view. However, when rendering the Tags no proper quoting is in place so the raw text is added to the DOM and rendered. This allows an attacker to store malicious code to a Ticket that will be evaluated when opening a Ticket.

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 @