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CVE-2026-34720— Zammad has an origin validation error in SSO mechanism

Quick assessment

Affected
zammad zammad
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zammad是德国Zammad公司的一套票务管理软件。 Zammad 7.0.1之前版本和6.5.4之前版本存在访问控制错误漏洞，该漏洞源于SSO机制未验证标头来源，可能导致安全风险。

AI Predicted 8.1 Difficulty: Easy EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34720

Vulnerability Information
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Vulnerability Title
Zammad has an origin validation error in SSO mechanism
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Zammad 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zammad是德国Zammad公司的一套票务管理软件。 Zammad 7.0.1之前版本和6.5.4之前版本存在访问控制错误漏洞，该漏洞源于SSO机制未验证标头来源，可能导致安全风险。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zammad zammad < 6.5.4 -

II. Public POCs for CVE-2026-34720

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III. Intelligence Information for CVE-2026-34720

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Same Patch Batch · zammad · 2026-04-08 · 10 CVEs total

CVE-2026-34722 Zammad is missing authorization in ticket create endpoint
CVE-2026-34724 Zammad has a server-side template injection leading to RCE via AI Agent
CVE-2026-34837 Zammad is miissing authorization in AI assistance controller for context data used in text
CVE-2026-34248 Zammad has an information disclosure in ticket detail view of customers in shared organiza
CVE-2026-34721 Zammad has Cross-site request forgery (CSRF) in OAuth callback endpoints
CVE-2026-34719 Zammad has a Server-side request forgery (SSRF) via webhooks
CVE-2026-34718 Zammad improperly neutralizes of script-related HTML tags in ticket articles
CVE-2026-34782 Zammad has improper access control in AI assistance controller for text tools
CVE-2026-34723 Zammad has incorrect access control in getting_started_controller

IV. Related Vulnerabilities

Same product: zammad
Same vendor: zammad
Same weakness: CWE-346

V. Comments for CVE-2026-34720

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