CVE-2025-8943

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-306 CWE-862

Affected software

Vendor	Product	Versions
—	—	< 3.0.1

References

https://research.jfrog.com/vulnerabilities/flowise-os-command-remote-code-execution-jfsa-2025-001380578/Exploit, Third Party Advisory

Timeline

Published: Aug 14, 2025
Last modified: Jun 17, 2026
NVD status: Analyzed

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