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CVE-2025-59527: Server-Side Request Forgery Vulnerability in Flowise Application

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Overview

CVE-2025-59527 is a critical vulnerability discovered in the Flowise application, specifically in the /api/v1/fetch-links endpoint. This Server-Side Request Forgery (SSRF) vulnerability exposes internal network web services to potential exploitation by attackers. The vulnerability is crucial as it allows potential system compromise or data leakage, impacting organizations using the affected version of the Flowise application.

Vulnerability Summary

CVE ID: CVE-2025-59527
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Flowise Application | 3.0.5

How the Exploit Works

The exploit works by an attacker sending a malicious request to the /api/v1/fetch-links endpoint of the Flowise application. This request tricks the server into acting as a proxy for the attacker, allowing them to access and explore the link structures of internal network web services.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP request:

GET /api/v1/fetch-links?target=http://internal.network.service HTTP/1.1
Host: vulnerable.flowise.server

In this example, the “http://internal.network.service” would be replaced with the internal network service the attacker wishes to access. The Flowise server, believing the request to be legitimate, acts as a proxy and provides the attacker with the information they need.

Mitigation

It is recommended to apply the vendor patch immediately. Flowise has patched this vulnerability in version 3.0.6. If immediate patching is not possible, organizations should use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and mitigate potential exploits of this vulnerability until the patch can be applied.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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