CVE-2025-8943

Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers

State: Published
Severity: 9.8 Critical
Published: Aug 14, 2025
Updated: Aug 18, 2025
Reserved: Aug 13, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	JFROG

Weaknesses

CWE-306 Missing Authentication for Critical Function
CWE-862 Missing Authorization

Affected Products

Product	Versions
flowise	before 3.0.1Affected

References

https://research.jfrog.com/vulnerabilities/flowise-os-command-remote-code-execution-jfsa-2025-001380578/third-party-advisory

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