CVE-2025-8943
CRITICALCVSS v3
9.8
CRITICAL
EPSS Score
78.8%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical Details
- Published
- 8/14/2025
Frequently Asked Questions
What is CVE-2025-8943?
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.
Is CVE-2025-8943 actively exploited?
Active exploitation of CVE-2025-8943 has not been confirmed. The EPSS score is 78.8%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2025-8943?
CVE-2025-8943 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2025-8943 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.