CVE-2025-59527: 
Flowise vulnerability analysis and mitigation

Flowise, a drag & drop user interface for building customized large language model flows, was found to contain a Server-Side Request Forgery (SSRF) vulnerability in version 3.0.5. The vulnerability was discovered in the /api/v1/fetch-links endpoint, which allows attackers to use the Flowise server as a proxy to access internal network web services and explore their link structures. The issue was disclosed on September 22, 2025, and has been patched in version 3.0.6 (GitHub Advisory).

The vulnerability exists in the fetch-links feature which is designed to extract links from external websites or XML sitemaps. The issue arises because the feature performs HTTP requests without validating user-supplied URLs. When the relativeLinksMethod parameter is set to webCrawl or xmlScrape, the server directly calls the fetch() function with the provided URL without proper validation. The vulnerability has been assigned a CVSS v3.1 base score of 7.5 (High) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (CISA, GitHub Advisory).

The vulnerability allows attackers to bypass firewall rules and access internal web applications and sensitive administrative interfaces. This could lead to the exposure of internal configuration, credentials, or secrets. The SSRF vulnerability significantly increases the risk of internal service enumeration and potential lateral movement in an enterprise environment (GitHub Advisory).

The vulnerability has been fixed in Flowise version 3.0.6. Users are strongly advised to upgrade to this version or later. The patch implements proper URL validation before making HTTP requests through the fetch-links endpoint (GitHub Advisory).