What’s Vulnerable › Vulnerabilities
CVE-2025-8943: Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 75.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2025-08-14 · updated 2026-06-17
- Weakness: CWE-306
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.
Affected products
- FlowiseAI Flowise: before 3.0.1 — fixed in 3.0.1
How to fix
Upgrade to a fixed version: FlowiseAI Flowise 3.0.1. Check the vendor advisory for mitigations.
References
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