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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
langgenius dify affected
Version Status Constraints
< 1.11.2 affected —

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
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
History

Tue, 03 Mar 2026 22:00:00 +0000

Type Values Removed Values Added
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.
Title Dify - Stored XSS in chat
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-03T21:43:32.391Z

Reserved: 2026-01-05T16:44:16.368Z

Link: CVE-2026-21866

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-03T22:16:27.973

Modified: 2026-03-03T22:16:27.973

Link: CVE-2026-21866

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses