CVE-2026-34720 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity High

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Zammad	Zammad

No data.

No data.

References

Link	Providers
https://www.spirityenterprise.com/pentest
https://www.spirityenterprise.com/managed-detection-response
https://github.com/zammad/zammad/security/advisories/GHSA-hcv6-w4h9-p2p7

History

Thu, 09 Apr 2026 17:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 08 Apr 2026 20:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Zammad Zammad zammad
Vendors & Products		Zammad Zammad zammad

Wed, 08 Apr 2026 18:45:00 +0000

Type	Values Removed	Values Added
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.
Title		Zammad has an origin validation error in SSO mechanism
Weaknesses		CWE-346
References		https://github.com/zammad/zammad/security/advisories/GHSA-hcv6-w4h9-p2p7
Metrics		cvssV4_0 `{'score': 2.3, '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'}`

MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-08T18:11:23.538Z

Updated: 2026-04-09T16:17:34.878Z

Reserved: 2026-03-30T18:41:20.753Z

Link: CVE-2026-34720

Vulnrichment

Updated: 2026-04-09T15:01:56.263Z

NVD

Status : Awaiting Analysis

Published: 2026-04-08T19:25:22.150

Modified: 2026-04-08T21:26:13.410

Link: CVE-2026-34720

Redhat

No data.

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