Vulnerability details
CVE-2025-8943
Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers
CVSS 3.1
9.8Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (JFROG) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| No product information recorded. | |||
References and advisories
1
Kolun on Telegram @kolunsec
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Details
- Published
- 2025-08-14
- Last updated
- 2025-08-18
- State
- Published
- Assigner (CNA)
- JFROG
- Kolun priority
- 40 · Medium
Exploit prediction (EPSS)
75.29%
Probability of exploitation in 30 days
99.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-306Missing Authentication for Critical Function
- CWE-862Missing Authorization