What’s Vulnerable › Vulnerabilities
CVE-2026-34718: Zammad improperly neutralizes of script-related HTML tags in ticket articles
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-08 · updated 2026-07-24
- Weakness: CWE-80
Description
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.
Affected products
- zammad: before 6.5.4; 7.0.0 — fixed in 6.5.4
How to fix
Upgrade to a fixed version: zammad 6.5.4. Check the vendor advisory for mitigations.
References
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