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CVE-2026-56274— Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess

Quick assessment

Affected
Flowise Flowise
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.1.2之前版本存在命令注入漏洞，该漏洞源于Custom MCP Server功能的命令标记验证不完整和正则表达式绕过，可能导致具有Flowise账户的攻击者绕过验证，执行任意命令。

CVSS 9.9 · Critical EPSS 7.52% · P94

Public Exploits 1

Metasploit · 1 flowise_mcp_rce.rb [exploit]

Affected Version Matrix 4

VendorProduct Version RangeStatus
Flowise Flowise < 3.1.2 affected
3.1.2 unaffected
Flowise Flowise Components < 3.1.2 affected
3.1.2 unaffected
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I. Basic Information for CVE-2026-56274

Vulnerability Information
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Vulnerability Title
Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.1.2之前版本存在命令注入漏洞，该漏洞源于Custom MCP Server功能的命令标记验证不完整和正则表达式绕过，可能导致具有Flowise账户的攻击者绕过验证，执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Flowise Flowise 0 ~ 3.1.2 -
Flowise Flowise Components 0 ~ 3.1.2 -

II. Public POCs for CVE-2026-56274

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 7341 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-56274

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Vendor Advisories for CVE-2026-56274 (2)

Same Patch Batch · Flowise · 2026-06-23 · 3 CVEs total

CVE-2025-71337 8.3 HIGH Flowise - Unverified Email Change via Account Profile Endpoint
CVE-2026-56275 Flowise - Server-Side Request Forgery via Execute Flow Base URL

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: Flowise
Same weakness: CWE-78

V. Comments for CVE-2026-56274

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