CVE-2026-21866

MEDIUM
2026-03-03 [email protected]
5.4
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 22:05 vuln.today
PoC Detected
Mar 05, 2026 - 21:24 vuln.today
Public exploit code
Patch Released
Mar 05, 2026 - 21:24 nvd
Patch available
CVE Published
Mar 03, 2026 - 22:16 nvd
MEDIUM 5.4

Tags

XSS AI / ML Dify

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.

Analysis

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. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

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Priority Score

47
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +27
POC: +20

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CVE-2026-21866 vulnerability details – vuln.today
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