medium5.4
CVE-2026-21866
Dify is an open-source LLM app development platform.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Dify | Dify | before 1.11.2 |