XSS in Langgenius Dify
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…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (2.0th percentile) — read the EPSS interpretation.
Affected products
- Langgenius Dify — versions < 1.11.2
Weakness classification (CWE)
References
- https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4 (x_refsource_CONFIRM)
- https://github.com/langgenius/dify/pull/29811 (x_refsource_MISC)
- https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564 (x_refsource_MISC)