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    CVE-2026-21866

    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.

    Published:Mar 3, 2026
    Last Modified:Apr 18, 2026
    EPS:Mar 3, 2026
    EPSS Score:0.00032
    CVSS Score:5.4

    Affected Products

    Vendor
    Dify
    Product
    Dify
    Vendor
    Langgenius
    Product
    Dify

    Exploits

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

    Related CVEs

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    CVE-2026-26023 (CVSS 5.3) — Dify is an open-source LLM app development platform. Prior to 1.13.0, a cross site scripting vulnerability has…
    CVE-2025-67732 (CVSS 8.4) — Dify is an open-source LLM app development platform. Prior to version 1.11.0, the API key is exposed in plaint…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High