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-2021-07
  • Date: 06/08/2020
  • Title: Text injection/Content Spoofing in 404 page
  • Severity: very low
  • Product: Zammad 1.0.x up to 4.0.0
  • Fixed in: Zammad 4.0.1, 4.1.0
  • References:
    --> CVE: CVE-2021-35300

Vulnerability Descriptions

Text injection/Content Spoofing in 404 page

Zammad comes with a custom "404 - Not Found" page to show users that the requested URL does not exist. However, when requesting a specially crafted URL the page will get rendered faulty which might lead users into visiting the attackers page.

Special 🙏 and 🤘 and ❤️ to:

  • N: Lutfu
  • C: SpyHackerz

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

Freuen Ihre Kunden sich schon auf die Service-Hotline?
Kostenlos testen!
Alle Neuigkeiten direkt in Ihrer Inbox!
Zum Newsletter anmelden