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-2023-07
  • Date: 2023-12-06
  • Title: Improper Input Validation
  • Severity: medium
  • Product: Zammad 6.1.x
  • Fixed in: Zammad 6.2.0
  • References:
    --> CVE-2023-50456

Vulnerability Descriptions

Improper Input Validation

Due to insufficient input validation for user data, an attacker could use malicious data as first or last name. This leads to phishing links in the generated notification emails.

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:

Please send remarks on security issues exclusively to

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