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CVE-2026-21866— Dify - Stored XSS in chat

EPSS 0.01% · P2
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I. Basic Information for CVE-2026-21866

Vulnerability Information
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Vulnerability Title
Dify - Stored XSS in chat
Source: NVD (National Vulnerability Database)
Vulnerability Description
Dify is an open-source LLM app development platform. Prior to 1.11.2, Dify is vulnerable to a stored XSS issue when rendering Mermaid diagrams within chats. This occurs because Dify’s default Mermaid configuration uses securityLevel: loose, which allows potentially unsafe content to execute. This vulnerability is fixed in 1.11.2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
dify 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
dify是LangGenius开源的一个开源的 LLM 应用程序开发平台。 dify 1.11.2之前版本存在跨站脚本漏洞，该漏洞源于渲染聊天中的Mermaid图表时默认配置安全级别宽松，可能导致存储型跨站脚本。
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

VendorProductAffected VersionsCPESubscribe
langgeniusdify < 1.11.2 -

II. Public POCs for CVE-2026-21866

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III. Intelligence Information for CVE-2026-21866

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IV. Related Vulnerabilities

Same product: dify
Same vendor: langgenius
Same weakness: CWE-79

V. Comments for CVE-2026-21866

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