CVE-2026-91935
Received Received - Intake

Flowise BaseURL Redirect Vulnerability Exposes API Keys

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

Description
Flowise before 3.1.4 fails to validate baseURL parameters in chat-model nodes, allowing authenticated users to redirect requests to arbitrary hosts. Attackers with chatflows:create or chatflows:update permissions can exfiltrate LLM provider API keys by redirecting requests to cloud metadata services or internal hosts.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91935
EUVD
EUVD-2026-78793

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
flowiseai flowise to 3.1.4 (exc)
flowise flowise to 3.1.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

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Executive Summary

Flowise before version 3.1.4 does not properly validate the baseURL parameter in chat-model nodes. This allows authenticated users with specific permissions to redirect requests to any host, potentially exposing sensitive data like LLM provider API keys.

Detection Guidance

To detect this vulnerability, inspect Flowise instances for unauthorized chat-model nodes with suspicious baseURL parameters pointing to external or internal metadata services (e.g., AWS IMDS at 169.254.169.254). Check logs for requests to cloud metadata endpoints or internal hosts from Flowise processes.

Impact Analysis

Attackers with chatflows:create or chatflows:update permissions could redirect requests to malicious hosts, exfiltrating API keys or accessing internal systems. This could lead to data breaches, unauthorized access, or service disruption.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, violating GDPR's data protection principles or HIPAA's security requirements. Organizations may face fines or penalties for failing to protect sensitive data.

Mitigation Strategies

Upgrade Flowise to version 3.1.4 or later to address the baseURL validation issue. Ensure only authorized users have chatflows:create or chatflows:update permissions to prevent unauthorized API key exfiltration.

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