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CVE-2026-34720

Zammad has an origin validation error in SSO mechanism

Published: Apr 8, 2026Updated: Apr 17, 2026 Sources: CVE List NVDCWE-346
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.1%
Top 98.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-346

Affected Products

zammadzammad
On-premWeb App
Enterprise Software / itsm-monitoring
zammadcommercialDEEnterprise Softwareaka zammad

Exploitability

Official Patch Available

References

https://github.com/zammad/zammad/security/advisories/GHSA-hcv6-w4h9-p2p7
github.com

Timeline

Published
Apr 8, 2026
Last Updated
Apr 17, 2026

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