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CVE-2026-34720

Zammad has an origin validation error in SSO mechanism

Low2.3EPSS 0.10%
Published
Updated
Reserved
Assigned by
GitHub_M

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.

Scores

CVSS scores of CVE-2026-34720, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)4.0Low2.3CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
NVDNVD · Analyzed4.0Low2.3CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.10% · top 99% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.3.

Weakness

Affected products

  • zammad · zammad

    • affected < 6.5.4
    • affected >= 7.0.0-alpha, < 7.0.1

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .