Security Advisory


· Please read carefully and check if the version of your Zammad system is affected by this vulnerability. Please send us information regarding vulnerabilities in Zammad!

Security Advisory Details

  • ID: ZAA-2021-03
  • Date: 06/08/2020
  • Title: Stored XSS in various model attributes
  • Severity: medium
  • Product: Zammad 1.0.x up to 4.0.0
  • Fixed in: Zammad 4.0.1, 4.1.0
  • References:
    --> CVE: CVE-2021-35298

Vulnerability Descriptions

Stored XSS in various model attributes

Zammad comes with a functionality store notes to various Models like Groups, Roles etc. It was possible to store XSS in these notes for an attacker with permissions to these Models. The malicious code would then be executed in the context of the current user session. However, storing notes to all of these Models required admin permissions.

Special 🙏 and 🤘 and ❤️ to:

  • N: ChungPD

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:

Additional information

Online version of this advisory:

Send all remarks to security issues to

Together we turn your customers into fans.
Start free trial!
All releases and news directly in your inbox.
Subscribe to the newsletter