CVE-2026-21866

MEDIUM

5.4

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.

CVE Details

CVSS v3.1 Score5.4

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published3/3/2026

Last Modified3/5/2026

Sourcenvd

Honeypot Sightings0

Affected Products

dify:dify

Weaknesses (CWE)

CWE-79

References

https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564(security-advisories@github.com)

https://github.com/langgenius/dify/pull/29811(security-advisories@github.com)

https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4(security-advisories@github.com)

IOC Correlations

No correlations recorded

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