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CVE-2026-34718— Zammad improperly neutralizes of script-related HTML tags in ticket articles

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之前版本存在安全漏洞，该漏洞源于HTML清理器对data: URI方案清理不当，可能导致存储恶意内容。

AI Predicted 5.3 Difficulty: Easy EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2026-34718

Vulnerability Information
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Vulnerability Title
Zammad improperly neutralizes of script-related HTML tags in ticket articles
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 HTML sanitizer for ticket articles was missing proper sanitization of data: ... URI schemes, resulting in storing such malicious content in the database of the Zammad instance. The Zammad GUI is rendering this content, due to applied CSP rules no harm was done by e.g., clicking such a link. 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:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Zammad 安全漏洞
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之前版本存在安全漏洞，该漏洞源于HTML清理器对data: URI方案清理不当，可能导致存储恶意内容。
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)

II. Public POCs for CVE-2026-34718

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III. Intelligence Information for CVE-2026-34718

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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-2026-34720 Zammad has an origin validation error in SSO mechanism
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-2026-34782 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-80

V. Comments for CVE-2026-34718

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