Is CVE-2025-8943 actively exploited?

CVE-2025-8943 has no public evidence of in-the-wild exploitation as of 2025-09-23.

What is the CVSS score for CVE-2025-8943?

CVE-2025-8943 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2025-8943?

Patch guidance is available from flowiseai security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-8943.

Fix CVE-2025-8943 - CRITICAL flowiseai flowise

Description

The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. However, Flowise's inherent authentication and authorization model is minimal and lacks role-based access controls (RBAC). Furthermore, in Flowise versions before 3.0.1 the default installation operates without authentication unless explicitly configured. This combination allows unauthenticated network attackers to execute unsandboxed OS commands.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-306 · Missing Authentication CWE-862 · Missing Authorization

Metadata

Primary Vendor: FLOWISEAI
Published: 8/14/2025
Last Modified: 9/23/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2025-8943

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary