EUVD-2026-20561CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/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
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3Description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4.
Analysis
Cross-site request forgery in Zammad OAuth callback endpoints for Microsoft, Google, and Facebook authentication allows authenticated attackers to hijack user sessions by crafting malicious requests that bypass CSRF state validation, potentially granting unauthorized access to user accounts and helpdesk data. The vulnerability affects Zammad versions prior to 7.0.1 and 6.5.4, and while no public exploit code has been identified, the attack requires user interaction and moderate attacker effort to execute successfully.
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