AI / ML CVE-2026-21866
MEDIUMSeverity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Dify versions prior to 1.11.2 contain a stored cross-site scripting vulnerability in Mermaid diagram rendering due to insecure default security configurations, allowing authenticated attackers with user interaction to inject and execute malicious scripts with cross-site impact. Public exploit code exists for this vulnerability, affecting users and developers of the Dify LLM application development platform. A patch is available in version 1.11.2 and later.
Technical ContextAI
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Dify. 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.
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 1.11.2.. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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