Security Advisory


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Security Advisory Details

  • ID: ZAA-2020-17
  • Date: 09/22/2020
  • Title: Tag and Link REST API endpoints lack CSRF token check
  • Severity: low
  • Product: Zammad 1.0.x up to 3.4.0
  • Fixed in: Zammad 3.4.1, 3.5.0
  • References:
    --> CVE: 2020-26033

Vulnerability Descriptions

Tag and Link REST API endpoints lack CSRF token check

The add and delete REST API endpoints for Tags and Links were requested via GET requests. Therefore no CSRF token checks were performed. Because of that an attacker could add or delete Tags and Links from a user that the web application trusts.

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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:

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