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.

INFO

Published Date :

2026-03-03T21:42:25.311Z

Last Modified :

2026-03-04T21:18:08.260Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21866 vulnerability.

Vendors Products
Dify
  • Dify
Langgenius
  • Dify
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21866.

URL Resource
https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564 cve-icon cve-icon
https://github.com/langgenius/dify/pull/29811 cve-icon cve-icon
https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Privileges Required
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VS Confidentiality
VS Integrity
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SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact