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Vulnerable Software

Vulnerability Details CVE-2026-34720

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 5.6%

CVSS Severity

CVSS v3 Score 4.3

References

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

Products affected by CVE-2026-34720

Zammad » Zammad » Version: 1.0.0

cpe:2.3:a:zammad:zammad:1.0.0
Zammad » Zammad » Version: 1.0.1

cpe:2.3:a:zammad:zammad:1.0.1
Zammad » Zammad » Version: 1.0.2

cpe:2.3:a:zammad:zammad:1.0.2
Zammad » Zammad » Version: 1.0.3

cpe:2.3:a:zammad:zammad:1.0.3
Zammad » Zammad » Version: 1.0.4

cpe:2.3:a:zammad:zammad:1.0.4
Zammad » Zammad » Version: 1.1.0

cpe:2.3:a:zammad:zammad:1.1.0
Zammad » Zammad » Version: 1.1.1

cpe:2.3:a:zammad:zammad:1.1.1
Zammad » Zammad » Version: 1.1.2

cpe:2.3:a:zammad:zammad:1.1.2
Zammad » Zammad » Version: 1.1.3

cpe:2.3:a:zammad:zammad:1.1.3
Zammad » Zammad » Version: 1.1.4

cpe:2.3:a:zammad:zammad:1.1.4
Zammad » Zammad » Version: 1.2.0

cpe:2.3:a:zammad:zammad:1.2.0
Zammad » Zammad » Version: 1.2.1

cpe:2.3:a:zammad:zammad:1.2.1
Zammad » Zammad » Version: 1.2.2

cpe:2.3:a:zammad:zammad:1.2.2
Zammad » Zammad » Version: 1.2.3

cpe:2.3:a:zammad:zammad:1.2.3
Zammad » Zammad » Version: 1.3.0

cpe:2.3:a:zammad:zammad:1.3.0
Zammad » Zammad » Version: 1.3.1

cpe:2.3:a:zammad:zammad:1.3.1
Zammad » Zammad » Version: 1.3.2

cpe:2.3:a:zammad:zammad:1.3.2
Zammad » Zammad » Version: 1.4.0

cpe:2.3:a:zammad:zammad:1.4.0
Zammad » Zammad » Version: 1.4.1

cpe:2.3:a:zammad:zammad:1.4.1
Zammad » Zammad » Version: 1.5.0

cpe:2.3:a:zammad:zammad:1.5.0
Zammad » Zammad » Version: 1.5.1

cpe:2.3:a:zammad:zammad:1.5.1
Zammad » Zammad » Version: 1.6.0

cpe:2.3:a:zammad:zammad:1.6.0
Zammad » Zammad » Version: 1.6.1

cpe:2.3:a:zammad:zammad:1.6.1
Zammad » Zammad » Version: 2.0.0

cpe:2.3:a:zammad:zammad:2.0.0
Zammad » Zammad » Version: 2.0.1

cpe:2.3:a:zammad:zammad:2.0.1
Zammad » Zammad » Version: 2.1.0

cpe:2.3:a:zammad:zammad:2.1.0
Zammad » Zammad » Version: 2.1.1

cpe:2.3:a:zammad:zammad:2.1.1
Zammad » Zammad » Version: 2.1.2

cpe:2.3:a:zammad:zammad:2.1.2
Zammad » Zammad » Version: 2.10.0

cpe:2.3:a:zammad:zammad:2.10.0
Zammad » Zammad » Version: 2.2.0

cpe:2.3:a:zammad:zammad:2.2.0
Zammad » Zammad » Version: 2.2.1

cpe:2.3:a:zammad:zammad:2.2.1
Zammad » Zammad » Version: 2.2.2

cpe:2.3:a:zammad:zammad:2.2.2
Zammad » Zammad » Version: 2.3.0

cpe:2.3:a:zammad:zammad:2.3.0
Zammad » Zammad » Version: 2.3.1

cpe:2.3:a:zammad:zammad:2.3.1
Zammad » Zammad » Version: 2.4.0

cpe:2.3:a:zammad:zammad:2.4.0
Zammad » Zammad » Version: 2.4.1

cpe:2.3:a:zammad:zammad:2.4.1
Zammad » Zammad » Version: 2.5.0

cpe:2.3:a:zammad:zammad:2.5.0
Zammad » Zammad » Version: 2.5.1

cpe:2.3:a:zammad:zammad:2.5.1
Zammad » Zammad » Version: 2.6.0

cpe:2.3:a:zammad:zammad:2.6.0
Zammad » Zammad » Version: 2.6.1

cpe:2.3:a:zammad:zammad:2.6.1
Zammad » Zammad » Version: 2.7.0

cpe:2.3:a:zammad:zammad:2.7.0
Zammad » Zammad » Version: 2.7.1

cpe:2.3:a:zammad:zammad:2.7.1
Zammad » Zammad » Version: 2.7.2

cpe:2.3:a:zammad:zammad:2.7.2
Zammad » Zammad » Version: 2.8.0

cpe:2.3:a:zammad:zammad:2.8.0
Zammad » Zammad » Version: 2.8.1

cpe:2.3:a:zammad:zammad:2.8.1
Zammad » Zammad » Version: 2.9.0

cpe:2.3:a:zammad:zammad:2.9.0
Zammad » Zammad » Version: 3.0.0

cpe:2.3:a:zammad:zammad:3.0.0
Zammad » Zammad » Version: 3.0.1

cpe:2.3:a:zammad:zammad:3.0.1
Zammad » Zammad » Version: 3.1.0

cpe:2.3:a:zammad:zammad:3.1.0
Zammad » Zammad » Version: 3.1.1

cpe:2.3:a:zammad:zammad:3.1.1
Zammad » Zammad » Version: 3.2.0

cpe:2.3:a:zammad:zammad:3.2.0
Zammad » Zammad » Version: 3.2.1

cpe:2.3:a:zammad:zammad:3.2.1
Zammad » Zammad » Version: 3.3.0

cpe:2.3:a:zammad:zammad:3.3.0
Zammad » Zammad » Version: 3.3.1

cpe:2.3:a:zammad:zammad:3.3.1
Zammad » Zammad » Version: 3.4.0

cpe:2.3:a:zammad:zammad:3.4.0
Zammad » Zammad » Version: 3.4.1

cpe:2.3:a:zammad:zammad:3.4.1
Zammad » Zammad » Version: 3.5.0

cpe:2.3:a:zammad:zammad:3.5.0
Zammad » Zammad » Version: 3.5.1

cpe:2.3:a:zammad:zammad:3.5.1
Zammad » Zammad » Version: 3.6.0

cpe:2.3:a:zammad:zammad:3.6.0
Zammad » Zammad » Version: 3.6.1

cpe:2.3:a:zammad:zammad:3.6.1
Zammad » Zammad » Version: 4.0.0

cpe:2.3:a:zammad:zammad:4.0.0
Zammad » Zammad » Version: 4.0.1

cpe:2.3:a:zammad:zammad:4.0.1
Zammad » Zammad » Version: 4.1.0

cpe:2.3:a:zammad:zammad:4.1.0
Zammad » Zammad » Version: 4.1.1

cpe:2.3:a:zammad:zammad:4.1.1
Zammad » Zammad » Version: 5.0.0

cpe:2.3:a:zammad:zammad:5.0.0
Zammad » Zammad » Version: 5.0.1

cpe:2.3:a:zammad:zammad:5.0.1
Zammad » Zammad » Version: 5.0.2

cpe:2.3:a:zammad:zammad:5.0.2
Zammad » Zammad » Version: 5.0.3

cpe:2.3:a:zammad:zammad:5.0.3
Zammad » Zammad » Version: 5.1.0

cpe:2.3:a:zammad:zammad:5.1.0
Zammad » Zammad » Version: 5.1.1

cpe:2.3:a:zammad:zammad:5.1.1
Zammad » Zammad » Version: 5.2.0

cpe:2.3:a:zammad:zammad:5.2.0
Zammad » Zammad » Version: 5.2.1

cpe:2.3:a:zammad:zammad:5.2.1
Zammad » Zammad » Version: 5.2.2

cpe:2.3:a:zammad:zammad:5.2.2
Zammad » Zammad » Version: 5.2.3

cpe:2.3:a:zammad:zammad:5.2.3
Zammad » Zammad » Version: 5.3.0

cpe:2.3:a:zammad:zammad:5.3.0
Zammad » Zammad » Version: 5.3.1

cpe:2.3:a:zammad:zammad:5.3.1
Zammad » Zammad » Version: 6.1.0

cpe:2.3:a:zammad:zammad:6.1.0
Zammad » Zammad » Version: 6.2.0

cpe:2.3:a:zammad:zammad:6.2.0
Zammad » Zammad » Version: 6.3.0

cpe:2.3:a:zammad:zammad:6.3.0
Zammad » Zammad » Version: 6.3.1

cpe:2.3:a:zammad:zammad:6.3.1
Zammad » Zammad » Version: 6.4.0

cpe:2.3:a:zammad:zammad:6.4.0
Zammad » Zammad » Version: 6.4.1

cpe:2.3:a:zammad:zammad:6.4.1
Zammad » Zammad » Version: 6.4.2

cpe:2.3:a:zammad:zammad:6.4.2
Zammad » Zammad » Version: 6.5.0

cpe:2.3:a:zammad:zammad:6.5.0
Zammad » Zammad » Version: 7.0.0

cpe:2.3:a:zammad:zammad:7.0.0

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Vulnerable Software

Vulnerability Details CVE-2026-34720

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