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.

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:

Additional information

Online version of this advisory:

Send all remarks to security issues to

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