CVE-2026-34720 Details
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.
A vulnerability exists in Zammad, a web-based open-source helpdesk and customer support system, in versions prior to 7.0.1 and 6.5.4. The issue arises because the Single Sign-On (SSO) mechanism did not properly verify whether the header came from a trusted SSO proxy or gateway before taking further action. This flaw has been addressed in versions 7.0.1 and 6.5.4.
Users can update to Zammad versions 7.0.1 or 6.5.4 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 9, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/zammad/zammad/security/advisories/GHSA-hcv6-w4h9-p2p7 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-346 | Origin Validation Error | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| zammad zammad | < 6.5.4 7.0.0 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 17, 2026 | Initial Analysis | [email protected] |
| Apr 8, 2026 | New CVE Received | [email protected] |