CVE-2025-8943
The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Se
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.
CRITICAL · CVSS 9.8
EPSS 0.82098
Act now
- EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
- EPSS percentile: top 1% of all CVEs by exploitation likelihood
- Public exploit or PoC is available
- SSVC automatable: yes - attacks can be scripted at scale
- CVSS base score ≥ 7.0
Sigma rules0
YARA rules0