CVE-2025-8943

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

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

flowise

CVSS v3.1 JFROG

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

EPSS

75.20% chance of exploitation in the next 30 days, 100th percentile

Nuclei

critical · CWE-78

Published

2025-08-14

Updated

2025-08-18

Proof-of-concept exploits (1)

• https://research.jfrog.com/vulnerabilities/flowise-os-command-remote-code-execution-jfsa-…

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8943.yaml

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/flowise_custommcp_rce…

Security advisories

• https://research.jfrog.com/vulnerabilities/flowise-os-command-remote-code-execution-jfsa-…
• advisories/GHSA-2vv2-3x8x-4gv7

References

• CVE Record
• NVD entry