Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers
87Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 9.8epss 72%
from disclosure to weapon0 days
Published on NVDAug 14
metasploitAug 14
VulnCheck+105d
exploitation probability
72%top 1% of all CVEs
observed exploitation
yesVulnCheck
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
flowise