---
title: "CVE-2025-8943: Flowise OS command remote code execution"
url: https://erroneo.us/security/cve/CVE-2025-8943/
description: "CVE-2025-8943 (flowise (npm)): The Custom MCPs feature is designed to execute OS commands, for instance, using tools like npx to spin up local MCP Servers.…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-08-14
date_modified: 2025-08-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-8943"
kev: false
cvss: 9.8
epss: 0.75203
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-8943: Flowise OS command remote code execution

**Signal:** High exploit likelihood. EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 75.2% , percentile 99.5: FIRST’s model estimates a 75.2% chance of exploitation activity in the next 30 days, higher than 99.5% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes flowise (npm) <= 3.0.5, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

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 packages

- npm `flowise` <= 3.0.5 → fixed: none listed

## Affected products (CVE record)

-  flowise: < 3.0.1

## Severity

- JFROG CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 75.20% probability of exploitation activity in the next 30 days; percentile 99.5.

## Sources

- [GitHub Advisory GHSA-2vv2-3x8x-4gv7](https://github.com/advisories/GHSA-2vv2-3x8x-4gv7)
- [CVE.org record CVE-2025-8943](https://www.cve.org/CVERecord?id=CVE-2025-8943)
- [NVD entry CVE-2025-8943](https://nvd.nist.gov/vuln/detail/CVE-2025-8943)
- [research.jfrog.com](https://research.jfrog.com/vulnerabilities/flowise-os-command-remote-code-execution-jfsa-2025-001380578/)

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Source page: https://erroneo.us/security/cve/CVE-2025-8943/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt