CVE-2025-8943
high-risk
Published 2025-08-14
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.
Do I need to act?
!
84.0% chance of exploitation in next 30 days
EPSS score — higher than 16% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10
Critical
NETWORK
/ LOW complexity
Affected Products (1)
Affected Vendors
References (1)
57
/ 100
high-risk
Severity
32/34 · Critical
Exploitability
20/34 · Moderate
Exposure
5/34 · Minimal