CVE-2026-34718
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
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. The Zammad GUI renders this content, but due to CSP rules no harm was done by clicking such a link. Fixed in 7.0.1 and 6.5.4.
Risk Assessment
Malicious content can be stored in the database and displayed to users, potentially leading to XSS attacks, though CSP mitigates direct harm.
Recommendation
Update Zammad to version 7.0.1 or 6.5.4 (depending on your release line).
Original NVD description (English source)
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.