CVE-2026-34720

MEDIUM

Zammad has an origin validation error in SSO mechanism

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 SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4.

References (1)

Scores

CVSS v3 4.3
EPSS 0.0002
EPSS Percentile 3.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-346
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