Flowise versions prior to 3.1.0 contain a Server-Side Request Forgery (SSRF) vulnerability in the Execute Flow function. An attacker can supply an intranet address via the base URL field, bypassing internal checks, causing the server to make HTTP requests to internal network addresses. This may allow attackers to enumerate internal services, access sensitive management interfaces, or leak confidential information. A fix is available that involves calling secureFetch for verification.