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-2020-23
  • Date: 11/16/2020
  • Title: Information Disclosure to agents being customers
  • Severity: low
  • Product: Zammad 3.5.0
  • Fixed in: Zammad 3.5.1, 3.6.0
  • References:
    --> CVE: 2020-29158

Vulnerability Descriptions

Information Disclosure to agents being customers

Zammad comes with a functionality for Agents being Customers in other Groups introduced in Zammad 3.5. However, when in the Ticket detail view an Agent being a Customer will be able to see internal Articles that should be only visible to full Agents of the Group. This results in an Information Disclosure enabling Agents being a Customer seeing internal information.

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

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