CVE-2026-34720 LOW

CVE-2026-34720: Zammad has an origin validation error in SSO mechanism

Vendor Zammad
Product zammad
Weakness CWE-346 · Origin validation
Published April 8, 2026
Last update April 9, 2026
View on NVD All CVEs

CVSS base score

2.3/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 8, 2026 CVE published
April 9, 2026 Record updated