CVE-2026-34718

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.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-08 | Updated 2026-04-08 | Assigner GitHub_M

Problem types

CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Product status

References

github.com/...zammad/security/advisories/GHSA-c2cf-9fc7-jhf3

cve.org (CVE-2026-34718)

nvd.nist.gov (CVE-2026-34718)

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