Is this vulnerability remotely exploitable over the internet?

It is not anonymous and internet-wide in the typical sense; exploitation requires authenticated access to the Flowise instance and the ability to define or run Custom Functions. However, once authenticated, a user can cause the server to make requests to internal or otherwise restricted targets.

What level of access does an attacker need to exploit this?

An attacker must be able to sign in to Flowise and create or modify flows containing Custom Functions, or otherwise execute existing flows that they control. No direct access to the underlying server or network is required; the vulnerability abuses the server's own network privileges.

What is the safest general fix pattern for this type of issue?

The most robust fix is to centralize outbound network access behind a single, validated interface and completely remove or strongly restrict direct access to low-level networking modules in untrusted execution environments. All requests from sandboxed code should pass through a security gateway that enforces allowlists and other SSRF protections.

Severity:

HIGH RISK

(7.1)

SSRF Protection Bypass (CWE-918) via Unrestricted Node.js Core Modules in Flowise Custom Function Sandbox

CVE-2026-41270

Published:

Apr 23, 2026

Status:

Modified

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-74;CWE-89

HIGH RISK

HIGH

(7.3)

SQL Injection via Unsanitized ID Parameter (CWE-89) in Pharmacy Sales and Inventory System /ajax.php

Database Compromise and Data Integrity Loss

April 27, 2026

CWE-863

HIGH RISK

HIGH

(8.5)

Incorrect Authorization (CWE-863) in OpenClaw chat.send Session Management

Privilege Escalation and Unauthorized Session Control

April 27, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-284;CWE-918

Impact:

Internal Network Access and SSRF via Sandbox Escape of Network Controls

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-284;CWE-918

Impact:

Internal Network Access and SSRF via Sandbox Escape of Network Controls

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Ask AI for summary of CodeAnt

SSRF Protection Bypass (CWE-918) via Unrestricted Node.js Core Modules in Flowise Custom Function Sandbox

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

SQL Injection via Unsanitized ID Parameter (CWE-89) in Pharmacy Sales and Inventory System /ajax.php

HIGH RISK

HIGH

(8.5)

Incorrect Authorization (CWE-863) in OpenClaw chat.send Session Management

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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