CVE-2026-34718CWE-80

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

Medium · published April 8, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
15.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00253 · 15.9th percentile
Weakness
CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Published
2026-04-08T18:01Z
EPSS history
Timeline
  • 08 APR 18:01Z
    Zammad improperly neutralizes of script-related HTML tags in ticket articles
    cvelistv5