CVE-2026-41270: Flowise: SSRF Protection Bypass via Unprotected Built-in HTTP Modules in Custom Function Sandbox

April 16, 2026 (updated April 27, 2026)

A Server-Side Request Forgery (SSRF) protection bypass vulnerability exists in the Custom Function feature. While the application implements SSRF protection via HTTP_DENY_LIST for axios and node-fetch libraries, the built-in Node.js http, https, and net modules are allowed in the NodeVM sandbox without equivalent protection. This allows authenticated users to bypass SSRF controls and access internal network resources (e.g., cloud provider metadata services)

References

github.com/FlowiseAI/Flowise
github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhmj-rg95-44hv
github.com/advisories/GHSA-xhmj-rg95-44hv
nvd.nist.gov/vuln/detail/CVE-2026-41270

Code Behaviors & Features

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