CVE-2026-34718— Zammad improperly neutralizes of script-related HTML tags in ticket articles
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
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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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
- CVE-2026-34837
Zammad is miissing authorization in AI assistance controller - CVE-2026-34782
Zammad has improper access control in AI assistance controll - CVE-2026-34724
Zammad has a server-side template injection leading to RCE v - CVE-2026-34723
Zammad has incorrect access control in getting_started_contr - CVE-2026-34722
Zammad is missing authorization in ticket create endpoint
Same vendor: zammad
- CVE-2026-34837
Zammad is miissing authorization in AI assistance controller - CVE-2026-34782
Zammad has improper access control in AI assistance controll - CVE-2026-34724
Zammad has a server-side template injection leading to RCE v - CVE-2026-34723
Zammad has incorrect access control in getting_started_contr - CVE-2026-34722
Zammad is missing authorization in ticket create endpoint
Same weakness: CWE-80
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WordPress GetPaid Plugin 2.4.6 HTML Injection via Help Text - CVE-2026-42030
MapServer: Improper Neutralization of Script-Related HTML Ta - CVE-2026-44264
Weblate is vulnerable to XSS via crafted Markdown - CVE-2026-6002
HTML Injection in DivvyDrive Information Technologies' Divvy - CVE-2025-59854
HCL DFXAnalytics is affected by an Insecure Security Header
V. Comments for CVE-2026-34718
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