CVE-2026-34718

MEDIUM

Zammad improperly neutralizes of script-related HTML tags in ticket articles

Title source: cna
STIX 2.1

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.

References (1)

Scores

CVSS v3 6.1
EPSS 0.0003
EPSS Percentile 9.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-80
Status published
Products (3)
zammad/zammad 7.0.0
zammad/zammad < 6.5.4 (2 CPE variants)
zammad/zammad >= 7.0.0-alpha, < 7.0.1
Published Apr 08, 2026
Tracked Since Apr 09, 2026