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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-34718

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the HTML sanitizer for ticket articles was missing proper sanitization of data: ... URI schemes, resulting in storing such malicious content in the database of the Zammad instance. The Zammad GUI is rendering this content, due to applied CSP rules no harm was done by e.g., clicking such a link. This vulnerability is fixed in 7.0.1 and 6.5.4.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 19.2%
CVSS Severity
CVSS v3 Score 6.1
Products affected by CVE-2026-34718
  • Zammad » Zammad » Version: 1.0.0
    cpe:2.3:a:zammad:zammad:1.0.0
  • Zammad » Zammad » Version: 1.0.1
    cpe:2.3:a:zammad:zammad:1.0.1
  • Zammad » Zammad » Version: 1.0.2
    cpe:2.3:a:zammad:zammad:1.0.2
  • Zammad » Zammad » Version: 1.0.3
    cpe:2.3:a:zammad:zammad:1.0.3
  • Zammad » Zammad » Version: 1.0.4
    cpe:2.3:a:zammad:zammad:1.0.4
  • Zammad » Zammad » Version: 1.1.0
    cpe:2.3:a:zammad:zammad:1.1.0
  • Zammad » Zammad » Version: 1.1.1
    cpe:2.3:a:zammad:zammad:1.1.1
  • Zammad » Zammad » Version: 1.1.2
    cpe:2.3:a:zammad:zammad:1.1.2
  • Zammad » Zammad » Version: 1.1.3
    cpe:2.3:a:zammad:zammad:1.1.3
  • Zammad » Zammad » Version: 1.1.4
    cpe:2.3:a:zammad:zammad:1.1.4
  • Zammad » Zammad » Version: 1.2.0
    cpe:2.3:a:zammad:zammad:1.2.0
  • Zammad » Zammad » Version: 1.2.1
    cpe:2.3:a:zammad:zammad:1.2.1
  • Zammad » Zammad » Version: 1.2.2
    cpe:2.3:a:zammad:zammad:1.2.2
  • Zammad » Zammad » Version: 1.2.3
    cpe:2.3:a:zammad:zammad:1.2.3
  • Zammad » Zammad » Version: 1.3.0
    cpe:2.3:a:zammad:zammad:1.3.0
  • Zammad » Zammad » Version: 1.3.1
    cpe:2.3:a:zammad:zammad:1.3.1
  • Zammad » Zammad » Version: 1.3.2
    cpe:2.3:a:zammad:zammad:1.3.2
  • Zammad » Zammad » Version: 1.4.0
    cpe:2.3:a:zammad:zammad:1.4.0
  • Zammad » Zammad » Version: 1.4.1
    cpe:2.3:a:zammad:zammad:1.4.1
  • Zammad » Zammad » Version: 1.5.0
    cpe:2.3:a:zammad:zammad:1.5.0
  • Zammad » Zammad » Version: 1.5.1
    cpe:2.3:a:zammad:zammad:1.5.1
  • Zammad » Zammad » Version: 1.6.0
    cpe:2.3:a:zammad:zammad:1.6.0
  • Zammad » Zammad » Version: 1.6.1
    cpe:2.3:a:zammad:zammad:1.6.1
  • Zammad » Zammad » Version: 2.0.0
    cpe:2.3:a:zammad:zammad:2.0.0
  • Zammad » Zammad » Version: 2.0.1
    cpe:2.3:a:zammad:zammad:2.0.1
  • Zammad » Zammad » Version: 2.1.0
    cpe:2.3:a:zammad:zammad:2.1.0
  • Zammad » Zammad » Version: 2.1.1
    cpe:2.3:a:zammad:zammad:2.1.1
  • Zammad » Zammad » Version: 2.1.2
    cpe:2.3:a:zammad:zammad:2.1.2
  • Zammad » Zammad » Version: 2.10.0
    cpe:2.3:a:zammad:zammad:2.10.0
  • Zammad » Zammad » Version: 2.2.0
    cpe:2.3:a:zammad:zammad:2.2.0
  • Zammad » Zammad » Version: 2.2.1
    cpe:2.3:a:zammad:zammad:2.2.1
  • Zammad » Zammad » Version: 2.2.2
    cpe:2.3:a:zammad:zammad:2.2.2
  • Zammad » Zammad » Version: 2.3.0
    cpe:2.3:a:zammad:zammad:2.3.0
  • Zammad » Zammad » Version: 2.3.1
    cpe:2.3:a:zammad:zammad:2.3.1
  • Zammad » Zammad » Version: 2.4.0
    cpe:2.3:a:zammad:zammad:2.4.0
  • Zammad » Zammad » Version: 2.4.1
    cpe:2.3:a:zammad:zammad:2.4.1
  • Zammad » Zammad » Version: 2.5.0
    cpe:2.3:a:zammad:zammad:2.5.0
  • Zammad » Zammad » Version: 2.5.1
    cpe:2.3:a:zammad:zammad:2.5.1
  • Zammad » Zammad » Version: 2.6.0
    cpe:2.3:a:zammad:zammad:2.6.0
  • Zammad » Zammad » Version: 2.6.1
    cpe:2.3:a:zammad:zammad:2.6.1
  • Zammad » Zammad » Version: 2.7.0
    cpe:2.3:a:zammad:zammad:2.7.0
  • Zammad » Zammad » Version: 2.7.1
    cpe:2.3:a:zammad:zammad:2.7.1
  • Zammad » Zammad » Version: 2.7.2
    cpe:2.3:a:zammad:zammad:2.7.2
  • Zammad » Zammad » Version: 2.8.0
    cpe:2.3:a:zammad:zammad:2.8.0
  • Zammad » Zammad » Version: 2.8.1
    cpe:2.3:a:zammad:zammad:2.8.1
  • Zammad » Zammad » Version: 2.9.0
    cpe:2.3:a:zammad:zammad:2.9.0
  • Zammad » Zammad » Version: 3.0.0
    cpe:2.3:a:zammad:zammad:3.0.0
  • Zammad » Zammad » Version: 3.0.1
    cpe:2.3:a:zammad:zammad:3.0.1
  • Zammad » Zammad » Version: 3.1.0
    cpe:2.3:a:zammad:zammad:3.1.0
  • Zammad » Zammad » Version: 3.1.1
    cpe:2.3:a:zammad:zammad:3.1.1
  • Zammad » Zammad » Version: 3.2.0
    cpe:2.3:a:zammad:zammad:3.2.0
  • Zammad » Zammad » Version: 3.2.1
    cpe:2.3:a:zammad:zammad:3.2.1
  • Zammad » Zammad » Version: 3.3.0
    cpe:2.3:a:zammad:zammad:3.3.0
  • Zammad » Zammad » Version: 3.3.1
    cpe:2.3:a:zammad:zammad:3.3.1
  • Zammad » Zammad » Version: 3.4.0
    cpe:2.3:a:zammad:zammad:3.4.0
  • Zammad » Zammad » Version: 3.4.1
    cpe:2.3:a:zammad:zammad:3.4.1
  • Zammad » Zammad » Version: 3.5.0
    cpe:2.3:a:zammad:zammad:3.5.0
  • Zammad » Zammad » Version: 3.5.1
    cpe:2.3:a:zammad:zammad:3.5.1
  • Zammad » Zammad » Version: 3.6.0
    cpe:2.3:a:zammad:zammad:3.6.0
  • Zammad » Zammad » Version: 3.6.1
    cpe:2.3:a:zammad:zammad:3.6.1
  • Zammad » Zammad » Version: 4.0.0
    cpe:2.3:a:zammad:zammad:4.0.0
  • Zammad » Zammad » Version: 4.0.1
    cpe:2.3:a:zammad:zammad:4.0.1
  • Zammad » Zammad » Version: 4.1.0
    cpe:2.3:a:zammad:zammad:4.1.0
  • Zammad » Zammad » Version: 4.1.1
    cpe:2.3:a:zammad:zammad:4.1.1
  • Zammad » Zammad » Version: 5.0.0
    cpe:2.3:a:zammad:zammad:5.0.0
  • Zammad » Zammad » Version: 5.0.1
    cpe:2.3:a:zammad:zammad:5.0.1
  • Zammad » Zammad » Version: 5.0.2
    cpe:2.3:a:zammad:zammad:5.0.2
  • Zammad » Zammad » Version: 5.0.3
    cpe:2.3:a:zammad:zammad:5.0.3
  • Zammad » Zammad » Version: 5.1.0
    cpe:2.3:a:zammad:zammad:5.1.0
  • Zammad » Zammad » Version: 5.1.1
    cpe:2.3:a:zammad:zammad:5.1.1
  • Zammad » Zammad » Version: 5.2.0
    cpe:2.3:a:zammad:zammad:5.2.0
  • Zammad » Zammad » Version: 5.2.1
    cpe:2.3:a:zammad:zammad:5.2.1
  • Zammad » Zammad » Version: 5.2.2
    cpe:2.3:a:zammad:zammad:5.2.2
  • Zammad » Zammad » Version: 5.2.3
    cpe:2.3:a:zammad:zammad:5.2.3
  • Zammad » Zammad » Version: 5.3.0
    cpe:2.3:a:zammad:zammad:5.3.0
  • Zammad » Zammad » Version: 5.3.1
    cpe:2.3:a:zammad:zammad:5.3.1
  • Zammad » Zammad » Version: 6.1.0
    cpe:2.3:a:zammad:zammad:6.1.0
  • Zammad » Zammad » Version: 6.2.0
    cpe:2.3:a:zammad:zammad:6.2.0
  • Zammad » Zammad » Version: 6.3.0
    cpe:2.3:a:zammad:zammad:6.3.0
  • Zammad » Zammad » Version: 6.3.1
    cpe:2.3:a:zammad:zammad:6.3.1
  • Zammad » Zammad » Version: 6.4.0
    cpe:2.3:a:zammad:zammad:6.4.0
  • Zammad » Zammad » Version: 6.4.1
    cpe:2.3:a:zammad:zammad:6.4.1
  • Zammad » Zammad » Version: 6.4.2
    cpe:2.3:a:zammad:zammad:6.4.2
  • Zammad » Zammad » Version: 6.5.0
    cpe:2.3:a:zammad:zammad:6.5.0
  • Zammad » Zammad » Version: 7.0.0
    cpe:2.3:a:zammad:zammad:7.0.0


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