EUVD-2026-20560
CVSS 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/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
Lifecycle Timeline
3Description
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.
Analysis
Zammad prior to versions 7.0.1 and 6.5.4 fails to validate that Single Sign-On (SSO) headers originate from trusted proxy/gateway sources before processing them, allowing authenticated attackers with particular preconditions to cause limited information disclosure. The vulnerability requires authentication, high attack complexity, and specific preconditions (AT:P in CVSS 4.0 vector), resulting in a low real-world risk profile despite network accessibility.
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